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CVE-2026-24688

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Date: January 27, 2026

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.

Severity Score

Related Resources (7)

https://github.com/py-pdf/pypdf/releases/tag/6.6.2
https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1
https://github.com/py-pdf/pypdf/pull/3610
https://github.com/py-pdf/pypdf
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73
https://nvd.nist.gov/vuln/detail/CVE-2026-24688
https://www.mend.io/vulnerability-database/CVE-2026-24688

Severity Score

Weakness Type (CWE)

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

Top Fix

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Upgrade to version pypdf - 6.6.2

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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