UNKNOWN PyPI
pypdf: Possible long runtimes/large memory usage for large CID font width ranges
PYSEC-2026-3656 · CVE-2026-71852 · GHSA-fwg2-594c-jp42
Published · Modified
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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.
References
- WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42
- WEB https://github.com/py-pdf/pypdf/pull/3946
- WEB https://github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7
- PACKAGE https://github.com/py-pdf/pypdf
- WEB https://github.com/py-pdf/pypdf/releases/tag/6.15.0
- PACKAGE https://pypi.org/project/pypdf
- ADVISORY https://github.com/advisories/GHSA-fwg2-594c-jp42
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-71852
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