Vulnerability · Published Oct 22, 2025 · Assigned by GitHub_M

CVE-2025-62708pypdf manipulated LZWDecode streams can exhaust RAM

Medium 6.6

In plain English

A medium-severity security flaw in pypdf from py-pdf. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.6Medium

Exploit odds (30 days)0.4%top 61.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	pypdf	no fix listed	DEBIAN-CVE-2025-62708
Debian:14	pypdf	6.9.0-1	DEBIAN-CVE-2025-62708
PyPI	pypdf	6.1.3	GHSA-jfx9-29x2-rv3j
PyPI	pypdf	6.1.3	PYSEC-2026-1831
Ubuntu:24.04:LTS	pypdf	no fix listed	UBUNTU-CVE-2025-62708
Ubuntu:25.10	pypdf	no fix listed	UBUNTU-CVE-2025-62708
Ubuntu:26.04:LTS	pypdf	no fix listed	UBUNTU-CVE-2025-62708
Ubuntu:26.10	pypdf	no fix listed	UBUNTU-CVE-2025-62708

Affected products (as reported)

Vendor	Product	Versions
py-pdf	pypdf	< 6.1.3

Weakness: CWE-409 · 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

References

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