CVE-2026-57204Medium▾ Sunlitpypdf: Missing stream length values ignore defined limits
▾ 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 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.2%
0.2% → 0.4%
Last analysed / modified upstream
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value.
This has been fixed in pypdf==6.13.3.
If you cannot upgrade yet, consider applying the changes from PR #3871.
pypdf < 6.13.3Upgrade to a patched release:
pypdf 6.13.3Connected by shared product, vendor, weakness, or advisory.
GHSA-jm82-fx9c-mx94Mediumpypdf: Missing stream length values ignore defined limits
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