CVE-2026-28804Medium▾ Sunlitpypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
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 long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter.
This has been fixed in pypdf==6.7.5.
If you cannot upgrade yet, consider applying the changes from PR #3666.
pypdf < 6.7.5Upgrade to a patched release:
pypdf 6.7.5Connected by shared product, vendor, weakness, or advisory.
CVE-2026-82398Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-84309Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-84311Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-84310Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-71870Mediumpypdf is a free and open-source pure-python PDF library
CVE-2026-71852Mediumpypdf is a free and open-source pure-python PDF library