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PYSEC-2026-3024
pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
Quick fix
PYSEC-2026-3024 — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.7.1'Details
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the `/ToUnicode` entry of a font with unusually large values, for example during text extraction.
### Patches
This has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3646](https://github.com/py-pdf/pypdf/pull/3646).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-27025[ADVISORY]
- https://github.com/py-pdf/pypdf/pull/3646[WEB]
- https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2[WEB]
- https://github.com/py-pdf/pypdf[PACKAGE]
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1[WEB]
- https://pypi.org/project/pypdf[PACKAGE]
- https://github.com/advisories/GHSA-wgvp-vg3v-2xq3[ADVISORY]