pypdf: Manipulated RunLengthDecode streams can exhaust RAM
### 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).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-28351US | medium5.3 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This req… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858WEB
- https://github.com/py-pdf/pypdf/pull/3664WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.7.4WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cgWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-28351ADVISORY
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