pypdf: Possible large memory usage when parsing content streams
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4218](https://github.com/py-pdf/pypdf/pull/4218).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-113791US | — | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to con… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12WEB
- https://github.com/py-pdf/pypdf/pull/4218WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.21.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77cWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-113791ADVISORY
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