py-pdf/pypdf · Security
pypdf: Manipulated XMP metadata entity declarations can exhaust RAM
- GHSA ID
- GHSA-3crg-w4f6-42mx
- CVE ID
- CVE-2026-40260
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v4
- 6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata.
Patches
This has been fixed in pypdf==6.10.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3724.
CWEs
- CWE-776 · Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx ↗
- https://github.com/py-pdf/pypdf/pull/3724 ↗
- https://github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.10.0 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-40260 ↗
- https://github.com/advisories/GHSA-3crg-w4f6-42mx ↗