CVE-2026-54651Medium▾ Sunlitpypdf: Possible infinite loop when processing threads/articles in writer
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 9.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.1%
0.1% → 0.2%
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer.
This has been fixed in pypdf==6.13.1.
If users cannot upgrade yet, consider applying the changes from PR #3839.
pypdf < 6.13.1Upgrade to a patched release:
pypdf 6.13.1Connected by shared product, vendor, weakness, or advisory.
CVE-2026-84309Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-59936Highpypdf: Possible infinite loop for not terminated inline images
CVE-2026-59935Highpypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)
CVE-2026-54530Mediumpypdf: Possible infinite loop when retrieving fonts for layout-mode text extraction
CVE-2026-54531Mediumpypdf: Possible infinite loop when processing outlines/bookmarks in writer
CVE-2026-82398Mediumpypdf is a free and open-source pure-python PDF library