pypdf possibly has long runtimes for malformed FlateDecode streams
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed `/FlateDecode` stream, where the byte-by-byte decompression is used. ### Patches This has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3644](https://github.com/py-pdf/pypdf/pull/3644).
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beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2026-27026US | medium5.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malfo… | ||||
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Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016WEB
- https://github.com/py-pdf/pypdf/pull/3644WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8hWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-27026ADVISORY
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