CVE-2026-40260: pypdf: Manipulated XMP metadata entity declarations can exhaust RAM

April 10, 2026 (updated April 24, 2026)

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata.

References

github.com/advisories/GHSA-3crg-w4f6-42mx
github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8
github.com/py-pdf/pypdf/pull/3724
github.com/py-pdf/pypdf/releases/tag/6.10.0
github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx
nvd.nist.gov/vuln/detail/CVE-2026-40260

Code Behaviors & Features

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