GHSA-f2v5-7jq9-h8cg

pypdf: Manipulated RunLengthDecode streams can exhaust RAM

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-28351

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.7.4	6.7.4

Details

As written in the advisory (Markdown source, shown as plain text).

### 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](https://github.com/py-pdf/pypdf/releases/tag/6.7.4). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3664](https://github.com/py-pdf/pypdf/pull/3664).

References

External links from the advisory. They lead to third-party sites.

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg web
https://nvd.nist.gov/vuln/detail/CVE-2026-28351 advisory
https://github.com/py-pdf/pypdf/pull/3664 web
https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.7.4 web