py-pdf/pypdf · Security
pypdf has long runtimes for wrong size values in cross-reference and object streams
- GHSA ID
- GHSA-jj6c-8h6c-hppx
- CVE ID
- CVE-2026-41168
- 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
- 4.8 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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 long runtimes. This requires cross-reference streams with wrong large /Size values or object streams with wrong large /N values.
Patches
This has been fixed in pypdf==6.10.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3733.
CWEs
- CWE-834 · Excessive Iteration
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx ↗
- https://github.com/py-pdf/pypdf/pull/3733 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.10.1 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-41168 ↗
- https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3 ↗
- https://github.com/advisories/GHSA-jj6c-8h6c-hppx ↗