CVE-2026-28351Medium▾ Sunlitpypdf: Manipulated RunLengthDecode streams can exhaust RAM
▾ 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 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.4%
Last analysed / modified upstream
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.
This has been fixed in pypdf==6.7.4.
If you cannot upgrade yet, consider applying the changes from PR #3664.
pypdf < 6.7.4Upgrade to a patched release:
pypdf 6.7.4Connected by shared product, vendor, weakness, or advisory.
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