HIGH 7.1 NVD
CVE-2026-119203
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
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 instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.
References
- https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a
- https://github.com/py-pdf/pypdf/pull/4289
- https://github.com/py-pdf/pypdf/releases/tag/6.21.4
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5
This high severity vulnerability with a CVSS score of 7.1 was published on 2026-10-29 via NVD.
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