CVE-2026-113791: pypdf: Possible large memory usage when parsing content streams

October 22, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations.

References

github.com/advisories/GHSA-cgf9-327m-v77c
github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12
github.com/py-pdf/pypdf/pull/4218
github.com/py-pdf/pypdf/releases/tag/6.21.0
github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77c
nvd.nist.gov/vuln/detail/CVE-2026-113791

Code Behaviors & Features

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