pypdf has a possible infinite loop when processing TreeObject
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a `TreeObject`, for example as part of outlines. ### Patches This has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3645](https://github.com/py-pdf/pypdf/pull/3645).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-27024US | medium5.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires acce… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295WEB
- https://github.com/py-pdf/pypdf/pull/3645WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgqWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-27024ADVISORY
scry
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