CVE-2026-27888

UNKNOWN 0.0

pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	py-pdf
Product	pypdf
Published	Feb 26, 2026
Last Updated	Feb 26, 2026

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Affected Versions

py-pdf / pypdf

< 6.7.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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