pypdf has possible Infinite Loop when processing outlines/bookmarks
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. ### Patches This has been fixed in [pypdf 6.6.2](https://github.com/py-pdf/pypdf/releases/tag/6.6.2). ### Workarounds If projects cannot upgrade yet, consider applying the changes from PR [#3610](https://github.com/py-pdf/pypdf/pull/3610).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-24688US | medium4.3 | Exploit | ||
pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-2q4j-m29v-hq73ADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1WEB
- https://github.com/py-pdf/pypdf/pull/3610WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.6.2WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-24688ADVISORY
- https://pypi.org/project/pypdfPACKAGE
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