CVE-2026-27026

Description

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.

PUBLISHED Reserved 2026-02-17 | Published 2026-02-20 | Updated 2026-02-20 | Assigner GitHub_M

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

References

github.com/.../pypdf/security/advisories/GHSA-9mvc-8737-8j8h

github.com/py-pdf/pypdf/pull/3644

github.com/...ommit/7905842d833f899f1d3228af7e7467ad80277016

github.com/py-pdf/pypdf/releases/tag/6.7.1

cve.org (CVE-2026-27026)

nvd.nist.gov (CVE-2026-27026)

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