PatchTheCVE: md4chttps://patchthecve.com/CVEs with upgrade or downgrade fix stepsCVE-2021-30027: md_analyze_line in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized memory, and cause a dhttps://patchthecve.com/cve/CVE-2021-30027.htmlhttps://patchthecve.com/cve/CVE-2021-30027.htmlWed, 17 Jun 2026 03:49:36 +0000MEDIUM 5.5: md_analyze_line in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized memory, and cause a denial of service via a malformed Markdown document.CVE-2020-26148: md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of uninitialized memory, and causehttps://patchthecve.com/cve/CVE-2020-26148.htmlhttps://patchthecve.com/cve/CVE-2020-26148.htmlWed, 17 Jun 2026 03:07:42 +0000HIGH 7.5: md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of uninitialized memory, and cause a denial of service (e.g., assertion failure) via a malformed Markdown document.CVE-2018-12112: md_build_attribute in md4c.c in md4c 0.2.6 allows remote attackers to cause a denial of service (Segmentation https://patchthecve.com/cve/CVE-2018-12112.htmlhttps://patchthecve.com/cve/CVE-2018-12112.htmlWed, 17 Jun 2026 01:37:10 +0000HIGH 7.8: md_build_attribute in md4c.c in md4c 0.2.6 allows remote attackers to cause a denial of service (Segmentation fault and application crash) or possibly have unspecified other impact via a crafted file.CVE-2018-12102: md4c 0.2.6 has a NULL pointer dereference in the function md_process_line in md4c.c, related to ctx->current_bhttps://patchthecve.com/cve/CVE-2018-12102.htmlhttps://patchthecve.com/cve/CVE-2018-12102.htmlWed, 17 Jun 2026 01:37:09 +0000MEDIUM 5.5: md4c 0.2.6 has a NULL pointer dereference in the function md_process_line in md4c.c, related to ctx->current_block.CVE-2018-11547: md_is_link_reference_definition_helper in md4c 0.2.5 has a heap-based buffer over-read because md_is_link_labehttps://patchthecve.com/cve/CVE-2018-11547.htmlhttps://patchthecve.com/cve/CVE-2018-11547.htmlWed, 17 Jun 2026 01:36:08 +0000CRITICAL 9.8: md_is_link_reference_definition_helper in md4c 0.2.5 has a heap-based buffer over-read because md_is_link_label mishandles loop termination.CVE-2018-11546: md4c 0.2.5 has a heap-based buffer over-read because md_is_named_entity_contents has an off-by-one error.https://patchthecve.com/cve/CVE-2018-11546.htmlhttps://patchthecve.com/cve/CVE-2018-11546.htmlWed, 17 Jun 2026 01:36:08 +0000CRITICAL 9.8: md4c 0.2.5 has a heap-based buffer over-read because md_is_named_entity_contents has an off-by-one error.CVE-2018-11545: md4c 0.2.5 has a heap-based buffer overflow in md_merge_lines because md_is_link_label mishandles the case of https://patchthecve.com/cve/CVE-2018-11545.htmlhttps://patchthecve.com/cve/CVE-2018-11545.htmlWed, 17 Jun 2026 01:36:08 +0000CRITICAL 9.8: md4c 0.2.5 has a heap-based buffer overflow in md_merge_lines because md_is_link_label mishandles the case of a link label composed solely of backslash escapes.CVE-2018-11536: md4c before 0.2.5 has a heap-based buffer overflow because md_split_simple_pairing_mark mishandles splits.https://patchthecve.com/cve/CVE-2018-11536.htmlhttps://patchthecve.com/cve/CVE-2018-11536.htmlWed, 17 Jun 2026 01:36:07 +0000CRITICAL 9.8: md4c before 0.2.5 has a heap-based buffer overflow because md_split_simple_pairing_mark mishandles splits.