HIGH 7.1 NVD
CVE-2026-119209
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-refere
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 across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.
References
- https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4
- https://github.com/py-pdf/pypdf/pull/4269
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc
This high severity vulnerability with a CVSS score of 7.1 was published on 2026-10-29 via NVD.
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