pypdf: Possible large memory usage when parsing arrays and dictionaries
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing arrays and/or dictionaries with lots of elements. ### 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-2026-113790US | — | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing arrays or dictionaries with many elements, causing parsing to consu… | ||||
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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-f54x-cmq8-qg57WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-113790ADVISORY
scry
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