medium6.9
CVE-2026-28351
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
Impact
### 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).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.7.4 | 6.7.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.7.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858
- https://github.com/py-pdf/pypdf/pull/3664
- https://github.com/py-pdf/pypdf/releases/tag/6.7.4
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg
- https://github.com/advisories/GHSA-f2v5-7jq9-h8cg
- https://nvd.nist.gov/vuln/detail/CVE-2026-28351