CVE-2026-27888

pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

CVSS 6.6 MEDIUMEPSS 0.3%CWE-400

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 6.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

26 feb 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.

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

Productos afectados

py-pdf · pypdf

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Referencias

https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c https://github.com/py-pdf/pypdf/pull/3658 https://github.com/py-pdf/pypdf/releases/tag/6.7.3 https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj