pypdf: Possible long runtimes/large memory usage when retrieving form fields
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. ### 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 [#4219](https://github.com/py-pdf/pypdf/pull/4219).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-113789US | — | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2WEB
- https://github.com/py-pdf/pypdf/pull/4219WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.21.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-113789ADVISORY
scry
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