GitHub Advisoryadvisory · PyPI

GHSA-x7hp-r3qg-r3cj pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

MEDIUM Published 2026-02-26 Modified 2026-02-26 Official page ↗
Aliases
CVE-2026-27888
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
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
Weaknesses
CWE-400
Reviewed
2026-02-26

Affected packages

• PyPI pypdf: < 6.7.3 → fixed in 6.7.3

Description

Impact 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`. Patches This has been fixed in pypdf==6.7.3. Workarounds If projects cannot upgrade yet, consider applying the changes from PR #3658.

Related

Alias · CVE (1)

  • CVE-2026-27888 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References