pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM
### Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. ### Patches This has been fixed in [pypdf==6.10.2](https://github.com/py-pdf/pypdf/releases/tag/6.10.2). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3734](https://github.com/py-pdf/pypdf/pull/3734).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41312US | medium6.5 | — | ||
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhau… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-7gw9-cf7v-778fADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11WEB
- https://github.com/py-pdf/pypdf/pull/3734WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.10.2WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778fWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41312ADVISORY
- https://pypi.org/project/pypdfPACKAGE
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