pypdf: Possible long runtimes for wrong size values in incremental mode
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. ### Patches This has been fixed in [pypdf==6.10.2](https://github.com/py-pdf/pypdf/releases/tag/6.10.2). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3735](https://github.com/py-pdf/pypdf/pull/3735).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41313US | medium6.5 | — | ||
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-4pxv-j86v-mhcwADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/c50a0104cf083356f7c7f5d61410466a57f5c88aWEB
- https://github.com/py-pdf/pypdf/pull/3735WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.10.2WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcwWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41313ADVISORY
- https://pypi.org/project/pypdfPACKAGE
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