CVE-2026-41312
MEDIUM6.5EPSS 0.03%pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM
Published: 4/16/2026Modified: 5/6/2026
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](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).
Affected packages (3)
- Debian/pypdffrom 0
- Debian/pypdf2from 0
- PyPI/pypdffrom 0, < 6.10.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-41312
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-41312
- PATCHhttps://github.com/py-pdf/pypdf
- WEBhttps://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11
- WEBhttps://github.com/py-pdf/pypdf/pull/3734
- WEBhttps://github.com/py-pdf/pypdf/releases/tag/6.10.2
- WEBhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778f