CVE-2026-119204High▾ Twilightpypdf has possible large memory usage when parsing page tree
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 31.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the page tree with many shared resources.
This has been fixed in pypdf==6.21.4.
If you cannot upgrade yet, consider applying the changes from PR #4290.
pypdf < 6.21.4Upgrade to a patched release:
pypdf 6.21.4Connected by shared product, vendor, weakness, or advisory.
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