https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2026-119209.htmlhttps://patchthecve.com/cve/CVE-2026-119209.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries acrhttps://patchthecve.com/cve/CVE-2026-119208.htmlhttps://patchthecve.com/cve/CVE-2026-119208.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts thttps://patchthecve.com/cve/CVE-2026-119207.htmlhttps://patchthecve.com/cve/CVE-2026-119207.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into veryhttps://patchthecve.com/cve/CVE-2026-119206.htmlhttps://patchthecve.com/cve/CVE-2026-119206.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums https://patchthecve.com/cve/CVE-2026-119205.htmlhttps://patchthecve.com/cve/CVE-2026-119205.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles thttps://patchthecve.com/cve/CVE-2026-119204.htmlhttps://patchthecve.com/cve/CVE-2026-119204.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can consume excessive memory while parsing a crafted PDF page tree containing many shared resources. Page-tree flattening copies page dictionary and inherited resource entries without a document-wide entry budget, allowihttps://patchthecve.com/cve/CVE-2026-119203.htmlhttps://patchthecve.com/cve/CVE-2026-119203.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position ihttps://patchthecve.com/cve/CVE-2026-113795.htmlhttps://patchthecve.com/cve/CVE-2026-113795.htmlMon, 02 Nov 2026 16:13:25 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, accessing a crafted PDF stream with a large number of filters or multiple filters that pass around large amounts of data can cause large memory consumption. This issue is fixed in version 6.20.0.https://patchthecve.com/cve/CVE-2026-113794.htmlhttps://patchthecve.com/cve/CVE-2026-113794.htmlMon, 02 Nov 2026 16:12:51 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.https://patchthecve.com/cve/CVE-2026-113789.htmlhttps://patchthecve.com/cve/CVE-2026-113789.htmlMon, 02 Nov 2026 16:12:15 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.https://patchthecve.com/cve/CVE-2026-103000.htmlhttps://patchthecve.com/cve/CVE-2026-103000.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming https://patchthecve.com/cve/CVE-2026-102999.htmlhttps://patchthecve.com/cve/CVE-2026-102999.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when anhttps://patchthecve.com/cve/CVE-2026-102998.htmlhttps://patchthecve.com/cve/CVE-2026-102998.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, https://patchthecve.com/cve/CVE-2026-102997.htmlhttps://patchthecve.com/cve/CVE-2026-102997.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that suhttps://patchthecve.com/cve/CVE-2026-102996.htmlhttps://patchthecve.com/cve/CVE-2026-102996.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a sihttps://patchthecve.com/cve/CVE-2026-102995.htmlhttps://patchthecve.com/cve/CVE-2026-102995.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extractionhttps://patchthecve.com/cve/CVE-2026-102994.htmlhttps://patchthecve.com/cve/CVE-2026-102994.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_untilhttps://patchthecve.com/cve/CVE-2026-102993.htmlhttps://patchthecve.com/cve/CVE-2026-102993.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of mehttps://patchthecve.com/cve/CVE-2026-84311.htmlhttps://patchthecve.com/cve/CVE-2026-84311.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, https://patchthecve.com/cve/CVE-2026-84310.htmlhttps://patchthecve.com/cve/CVE-2026-84310.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths becauhttps://patchthecve.com/cve/CVE-2026-84309.htmlhttps://patchthecve.com/cve/CVE-2026-84309.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. https://patchthecve.com/cve/CVE-2026-82398.htmlhttps://patchthecve.com/cve/CVE-2026-82398.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes chttps://patchthecve.com/cve/CVE-2026-71870.htmlhttps://patchthecve.com/cve/CVE-2026-71870.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap during text extraction. This issue is fixed https://patchthecve.com/cve/CVE-2026-71852.htmlhttps://patchthecve.com/cve/CVE-2026-71852.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extracthttps://patchthecve.com/cve/CVE-2026-59936.htmlhttps://patchthecve.com/cve/CVE-2026-59936.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.1, an attacker can craft a PDF with a page content stream containing a not terminated inline image, causing an infinite loop during inline image end marker detection such as when extracting page text. This issue is fixed in versihttps://patchthecve.com/cve/CVE-2026-59935.htmlhttps://patchthecve.com/cve/CVE-2026-59935.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craft a PDF with a page content stream containing a not terminated inline image that uses the ASCII85 or ASCIIHex filters, causing an infinite loop during parsing such as when extracting page text. This issue ihttps://patchthecve.com/cve/CVE-2026-59938.htmlhttps://patchthecve.com/cve/CVE-2026-59938.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.https://patchthecve.com/cve/CVE-2026-59937.htmlhttps://patchthecve.com/cve/CVE-2026-59937.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.https://patchthecve.com/cve/CVE-2026-57204.htmlhttps://patchthecve.com/cve/CVE-2026-57204.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 6.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream withttps://patchthecve.com/cve/CVE-2026-54651.htmlhttps://patchthecve.com/cve/CVE-2026-54651.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.https://patchthecve.com/cve/CVE-2026-54531.htmlhttps://patchthecve.com/cve/CVE-2026-54531.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0.https://patchthecve.com/cve/CVE-2026-54530.htmlhttps://patchthecve.com/cve/CVE-2026-54530.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires extracting the text in layout mode. This vulnerability is fixed in 6.13.0.https://patchthecve.com/cve/CVE-2026-49461.htmlhttps://patchthecve.com/cve/CVE-2026-49461.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references. This vulnerability is fixed in 6.12.2.https://patchthecve.com/cve/CVE-2026-49460.htmlhttps://patchthecve.com/cve/CVE-2026-49460.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.https://patchthecve.com/cve/CVE-2026-48735.htmlhttps://patchthecve.com/cve/CVE-2026-48735.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements. This vulnerability is fixed in 6.12.1.https://patchthecve.com/cve/CVE-2026-48156.htmlhttps://patchthecve.com/cve/CVE-2026-48156.htmlMon, 02 Nov 2026 16:06:04 +0000LOW 3.3: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.https://patchthecve.com/cve/CVE-2026-48155.htmlhttps://patchthecve.com/cve/CVE-2026-48155.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.https://patchthecve.com/cve/CVE-2026-41314.htmlhttps://patchthecve.com/cve/CVE-2026-41314.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 6.5: pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing an image using `/FlateDecode` with large size values. This has been fixed in pypdf 6.10.2.https://patchthecve.com/cve/CVE-2026-41313.htmlhttps://patchthecve.com/cve/CVE-2026-41313.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 6.5: pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As https://patchthecve.com/cve/CVE-2026-41312.htmlhttps://patchthecve.com/cve/CVE-2026-41312.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 6.5: pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictorhttps://patchthecve.com/cve/CVE-2026-41168.htmlhttps://patchthecve.com/cve/CVE-2026-41168.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This hhttps://patchthecve.com/cve/CVE-2026-40260.htmlhttps://patchthecve.com/cve/CVE-2026-40260.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. An attacker who exploits this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. This issue has behttps://patchthecve.com/cve/CVE-2026-33699.htmlhttps://patchthecve.com/cve/CVE-2026-33699.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applyhttps://patchthecve.com/cve/CVE-2026-33123.htmlhttps://patchthecve.com/cve/CVE-2026-33123.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 6.5: pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.https://patchthecve.com/cve/CVE-2026-31826.htmlhttps://patchthecve.com/cve/CVE-2026-31826.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vhttps://patchthecve.com/cve/CVE-2026-28804.htmlhttps://patchthecve.com/cve/CVE-2026-28804.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.https://patchthecve.com/cve/CVE-2026-28351.htmlhttps://patchthecve.com/cve/CVE-2026-28351.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.3: pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, https://patchthecve.com/cve/CVE-2026-27888.htmlhttps://patchthecve.com/cve/CVE-2026-27888.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`https://patchthecve.com/cve/CVE-2026-27628.htmlhttps://patchthecve.com/cve/CVE-2026-27628.htmlMon, 02 Nov 2026 16:06:04 +0000HIGH 7.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.https://patchthecve.com/cve/CVE-2026-27026.htmlhttps://patchthecve.com/cve/CVE-2026-27026.htmlMon, 02 Nov 2026 16:06:04 +0000MEDIUM 5.5: pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.