CVE-2025-62708

pypdf manipulated LZWDecode streams can exhaust RAM

State: Published
Severity: 6.6 Medium
Published: Oct 22, 2025
Updated: Oct 23, 2025
Reserved: Oct 20, 2025

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. This has been fixed in pypdf version 6.1.3.

Scores

CVSS	Score	Vector	Source
4.0	6.6 Medium	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	GitHub_M

Weaknesses

CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

Affected Products

Product	Versions
pypdfpy-pdf	< 6.1.3Affected

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j
https://github.com/py-pdf/pypdf/pull/3502
https://github.com/py-pdf/pypdf/commit/e51d07807ffcdaf18077b9486dadb3dc05b368da
https://github.com/py-pdf/pypdf/releases/tag/6.1.3

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.