CVE-2026-59937Medium· 6.5▾ SunlitA flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams. This could cause the pypdf library to spend ex…
▾ 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 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
0.3% → 0.6%
Last analysed / modified upstream
— → 6.5
A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams. This could cause the pypdf library to spend excessive time recovering broken cross-reference table entries, leading to a denial of service (DoS) condition for applications processing such files.
pypdf: pypdf: Denial of Service via crafted PDF with malformed cross-reference streams — rated Moderate by Red Hat. Released 2026-07-08, updated 2026-10-15.
Affected:
No fix planned:
Fix deferred
Affected packages:
pypdf < 6.14.0Patched in:
pypdf 6.14.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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