pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
### Impact 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. ### Patches This has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-28804US | medium5.3 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98fWEB
- https://github.com/py-pdf/pypdf/pull/3666WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.7.5WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-28804ADVISORY
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