py-pdf/pypdf · Security
pypdf: Possible large memory usage when parsing content streams
- GHSA ID
- GHSA-cgf9-327m-v77c
- CVE ID
- CVE-2026-113791
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/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 content streams with many small operations.
Patches
This has been fixed in pypdf==6.21.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4218.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
- CWE-770 · Allocation of Resources Without Limits or Throttling
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77c ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-113791 ↗
- https://github.com/py-pdf/pypdf/pull/4218 ↗
- https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.21.0 ↗
- https://github.com/advisories/GHSA-cgf9-327m-v77c ↗