CVE-2026-24688

Description

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.

PUBLISHED Reserved 2026-01-23 | Published 2026-01-27 | Updated 2026-01-27 | Assigner GitHub_M

Problem types

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Product status

References

github.com/.../pypdf/security/advisories/GHSA-2q4j-m29v-hq73

github.com/py-pdf/pypdf/pull/3610

github.com/...ommit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1

github.com/py-pdf/pypdf/releases/tag/6.6.2

cve.org (CVE-2026-24688)

nvd.nist.gov (CVE-2026-24688)

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