CVE-2026-113791Medium· 6.0▾ Sunlitpypdf: Possible large memory usage when parsing content streams
▾ Sunlit zone — Low / medium · no exploitation signal
impact 33 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
0.3% → 0.4%
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations.
This has been fixed in pypdf==6.21.0.
If you cannot upgrade yet, consider applying the changes from PR #4218.
pypdf < 6.21.0Upgrade to a patched release:
pypdf 6.21.0Connected by shared product, vendor, weakness, or advisory.
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