CVE-2026-27026

pypdf possibly has long runtimes for malformed FlateDecode streams

CVSS 6.9 MEDIUMEPSS 0.2%CWE-770

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 malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Productos afectados

py-pdf · pypdf

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Referencias

https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016 https://github.com/py-pdf/pypdf/pull/3644 https://github.com/py-pdf/pypdf/releases/tag/6.7.1 https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h