CVE-2026-28804: pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
(updated )
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.
References
- github.com/advisories/GHSA-9m86-7pmv-2852
- github.com/py-pdf/pypdf
- github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f
- github.com/py-pdf/pypdf/pull/3666
- github.com/py-pdf/pypdf/releases/tag/6.7.5
- github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852
- nvd.nist.gov/vuln/detail/CVE-2026-28804
Code Behaviors & Features
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