Loop with Unreachable Exit Condition ('Infinite Loop') Affecting pypdf package, versions <6.9.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.39% (31st percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-PYPDF-15123217
  • published28 Jan 2026
  • disclosed27 Jan 2026

Introduced: 27 Jan 2026

CVE-2026-24688  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade Debian:unstable pypdf to version 6.9.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pypdf package and not the pypdf package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.

CVSS Base Scores

version 3.1