CVE-2026-102997pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)

Descripción

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3 Vendor Advisory
• https://github.com/py-pdf/pypdf/pull/4073 PatchIssue Tracking
• https://github.com/py-pdf/pypdf/commit/d9d38cf99b115deb562d3b68f36c33027bc04f79 Patch
• https://github.com/py-pdf/pypdf/releases/tag/6.18.1 Release Notes