py-pdf/pypdf · Security
pypdf: Possible large memory usage for wrong image dimensions
- GHSA ID
- GHSA-5qjq-93h5-hrgp
- CVE ID
- CVE-2026-59938
- Severity
- medium
- Published
- Updated
- 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 loading images where the declared size values are much too large compared to the actual data.
Patches
This has been fixed in pypdf==6.14.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3888.
CWEs
- CWE-789 · Memory Allocation with Excessive Size Value
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5qjq-93h5-hrgp ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-59938 ↗
- https://github.com/py-pdf/pypdf/pull/3888 ↗
- https://github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.14.0 ↗
- https://github.com/advisories/GHSA-5qjq-93h5-hrgp ↗