Bug 2428427 (CVE-2026-22691) - CVE-2026-22691 pypdf: pypdf: Denial of Service via malformed PDF startxref entries
Summary: CVE-2026-22691 pypdf: pypdf: Denial of Service via malformed PDF startxref en...
Keywords:
Status: NEW
Alias: CVE-2026-22691
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-10 05:01 UTC by OSIDB Bzimport
Modified: 2026-01-15 03:10 UTC (History)
38 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-01-10 05:01:32 UTC 
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
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