py-pdf/pypdf · Security
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
- GHSA ID
- GHSA-f2v5-7jq9-h8cg
- CVE ID
- CVE-2026-28351
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.
Patches
This has been fixed in pypdf==6.7.4.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3664.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-28351 ↗
- https://github.com/py-pdf/pypdf/pull/3664 ↗
- https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.7.4 ↗
- https://github.com/advisories/GHSA-f2v5-7jq9-h8cg ↗