pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM_CVE-2026-41312

4.8 / 10

MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Description

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.

Basic Information

ID CVE-2026-41312

Source GitHub_M

Published Apr 22, 2026 at 21:02

Modified Apr 22, 2026 at 21:04

Affected Product

Vendor py-pdf

Product pypdf

Version < 6.10.2

Affected Versions py-pdf pypdf < 6.10.2

CWE Classification

CWE-789

References

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    "published": "2026-04-22T21:02:53.156Z",
    "modified": "2026-04-22T21:04:22.958Z",
    "type": "cve",
    "title": "pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM",
    "source": "GitHub_M",
    "references": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-7gw9-cf7v-778f\nhttps://github.com/py-pdf/pypdf/pull/3734\nhttps://github.com/py-pdf/pypdf/commit/ac734dab4eef92bcce50d503949b4d9887d89f11\nhttps://github.com/py-pdf/pypdf/releases/tag/6.10.2",
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