CVE-2026-41312
MEDIUMpypdf: Manipulated FlateDecode predictor parameters can exhaust RAM
Title source: cnaDescription
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 exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
References (4)
Core 4
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3734
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.10.2
X_Refsource_Confirm x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778f
Scores
CVSS v3
6.5
EPSS
0.0023
EPSS Percentile
13.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-789
Status
published
Products (3)
py-pdf/pypdf
< 6.10.2
pypdf_project/pypdf
< 6.10.2
pypi/pypdf
0 - 6.10.2PyPI
Published
Apr 22, 2026
Tracked Since
Apr 23, 2026