py-pdf/pypdf · Security
pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM
- GHSA ID
- GHSA-7gw9-cf7v-778f
- CVE ID
- CVE-2026-41312
- Severity
- medium
- Published
- Updated
- CVSS
- 6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CVSS v3
- 6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CVSS v4
- 6.8 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
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.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3734.
CWEs
- CWE-789 · Memory Allocation with Excessive Size Value
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778f ↗
- https://github.com/py-pdf/pypdf/pull/3734 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.10.2 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-41312 ↗
- https://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11 ↗
- https://github.com/advisories/GHSA-7gw9-cf7v-778f ↗