MEDIUM GitHub
CVE-2026-113795
pypdf: Possible large memory usage for streams with multiple filters
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing any stream with a large amount of filters or multiple filters which pass around large amounts of data.
### Patches
This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4173](https://github.com/py-pdf/pypdf/pull/4173).
Affected Products
- pip/pypdf < 6.20.0
References
- https://github.com/advisories/GHSA-7mh2-4gg2-979f
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7mh2-4gg2-979f
- https://github.com/py-pdf/pypdf/pull/4173
- https://github.com/py-pdf/pypdf/commit/80a84d4be6022d910874ccb0d2365400f3f0e185
This medium severity vulnerability was published on 2026-10-21 via GitHub. Affected: pip/pypdf < 6.20.0.
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