PatchTheCVECVE-2026-119205: pypdf is a free and open-source pure-python PDF library
CVE-2026-119205 is a medium-severity flaw (CVSS 5.5) affecting pypdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 to evade the visited-object check. This issue is fixed in version 6.21.4.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 77%) |
| CISA exploited list | No |
| Weakness | CWE-835 |
| Published | 2026-10-29 |
| Last modified | 2026-11-02 |
Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- Vulners Bulletins: CVE-2026-119205 2026-10-30
- VulDB Recent Entries: CVE-2026-119205 | py-pdf pypdf up to 6.21.3 infinite loop 2026-10-29
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-119205?
pypdf: upgrade to 6.21.4. Exact commands for each OS are on this page.
Is CVE-2026-119205 being exploited?
CVE-2026-119205 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-119205 affect?
CVE-2026-119205 affects pypdf. Severity is medium (CVSS 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 t
How urgent is CVE-2026-119205?
Priority 25/100. No elevated risk signals yet.
Software pages
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