py-pdf/pypdf · Security
pypdf: Possible long runtimes/large memory usage for large CID font width ranges
- GHSA ID
- GHSA-fwg2-594c-jp42
- CVE ID
- CVE-2026-71852
- Severity
- medium
- Published
- Updated
- 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 and large memory consumption. This requires parsing the font width entries of a font with unusually large values, for example during text extraction.
Patches
This has been fixed in pypdf==6.15.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3946.
CWEs
- CWE-834 · Excessive Iteration
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42 ↗
- https://github.com/py-pdf/pypdf/pull/3946 ↗
- https://github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.15.0 ↗
- https://github.com/advisories/GHSA-fwg2-594c-jp42 ↗