py-pdf/pypdf · Security
pypdf can exhaust RAM via manipulated LZWDecode streams
- GHSA ID
- GHSA-jfx9-29x2-rv3j
- CVE ID
- CVE-2025-62708
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.6 · 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
Description
Impact
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.
Patches
This has been fixed in pypdf==6.1.3.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3502.
CWEs
- CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
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://nvd.nist.gov/vuln/detail/CVE-2025-62708 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.1.3 ↗
- https://github.com/advisories/GHSA-jfx9-29x2-rv3j ↗