medium6.9
CVE-2026-27024
pypdf has a possible infinite loop when processing TreeObject
Impact
### 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).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.7.1 | 6.7.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.7.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295
- https://github.com/py-pdf/pypdf/pull/3645
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq
- https://github.com/advisories/GHSA-996q-pr4m-cvgq
- https://nvd.nist.gov/vuln/detail/CVE-2026-27024