CVE-2026-48735

pypdf: Manipulated XMP metadata streams can exhaust RAM

State: Published
Severity: 6.9 Medium
Published: May 28, 2026
Updated: Jun 2, 2026
Reserved: May 22, 2026

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements. This vulnerability is fixed in 6.12.1.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
pypdfpy-pdf	< 6.12.1Affected

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-wjqc-6w8f-h24c
https://github.com/py-pdf/pypdf/pull/3796
https://github.com/py-pdf/pypdf/releases/tag/6.12.1

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