CVE-2026-22691Medium· 6.5▾ SunlitA flaw was found in pypdf. A remote attacker can exploit this vulnerability by crafting a malicious PDF file with malformed startxref entries and excessive whitespace characters. This can cause excessively long processing times when rebuil…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.4%
0.4% → 0.4%
Last analysed / modified upstream
— → 6.5
low → medium
A flaw was found in pypdf. A remote attacker can exploit this vulnerability by crafting a malicious PDF file with malformed startxref entries and excessive whitespace characters. This can cause excessively long processing times when rebuilding the cross-reference table in non-strict reading mode, leading to a denial of service.
pypdf: pypdf: Denial of Service via malformed PDF startxref entries — rated Moderate by Red Hat. Released 2026-01-10, updated 2026-10-15.
Affected:
No fix planned:
Fix deferred
Affected packages:
pypdf < 6.6.0Patched in:
pypdf 6.6.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-22690Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with missing /Root object (CVE-2026-22690)
CVE-2026-59937Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with malformed cross-reference streams (CVE-2026-59937)
CVE-2026-27888Medium· 5.3pypdf: pypdf: Denial of Service via crafted PDF (CVE-2026-27888)
CVE-2026-27025Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with large font values (CVE-2026-27025)
CVE-2026-27026Medium· 6.5pypdf: pypdf: Denial of Service via malformed PDF /FlateDecode stream (CVE-2026-27026)
CVE-2026-24688Medium· 5.3pypdf: pypdf Infinite Loop when processing outlines/bookmarks (CVE-2026-24688)