pypdf: Possible long runtimes for repeated malformed cross-reference entries
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams. ### Patches This has been fixed in [pypdf==6.14.0](https://github.com/py-pdf/pypdf/releases/tag/6.14.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3887](https://github.com/py-pdf/pypdf/pull/3887).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-59937US | high7.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50daeWEB
- https://github.com/py-pdf/pypdf/pull/3887WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.14.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37vWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-59937ADVISORY
scry
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