CVE-2026-59937Medium▾ Sunlitpypdf: Possible long runtimes for repeated malformed cross-reference entries
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
Last analysed / modified upstream
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.
This has been fixed in pypdf==6.14.0.
If you cannot upgrade yet, consider applying the changes from PR #3887.
pypdf < 6.14.0Upgrade to a patched release:
pypdf 6.14.0Connected by shared product, vendor, weakness, or advisory.
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