CVE-2026-27888: pypdf: Manipulated FlateDecode XFA streams can exhaust RAM
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.
References
- github.com/advisories/GHSA-x7hp-r3qg-r3cj
- github.com/py-pdf/pypdf
- github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
- github.com/py-pdf/pypdf/pull/3658
- github.com/py-pdf/pypdf/releases/tag/6.7.3
- github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
- nvd.nist.gov/vuln/detail/CVE-2026-27888
Code Behaviors & Features
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