PYSEC-2026-3014
pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
At a glance
- Published
- Updated
- CVE
- CVE-2026-28804
- Aliases
- GHSA-9m86-7pmv-2852
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
### 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).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.7.5 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-28804 ADVISORY
- https://github.com/py-pdf/pypdf/pull/3666 WEB
- https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.7.5 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-9m86-7pmv-2852 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |