PYSEC-2026-3021
pypdf has long runtimes for wrong size values in cross-reference and object streams
At a glance
- Published
- Updated
- CVE
- CVE-2026-41168
- Aliases
- GHSA-jj6c-8h6c-hppx
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS_V4
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. ### Patches This has been fixed in [pypdf==6.10.1](https://github.com/py-pdf/pypdf/releases/tag/6.10.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3733](https://github.com/py-pdf/pypdf/pull/3733).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.10.1 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41168 ADVISORY
- https://github.com/py-pdf/pypdf/pull/3733 WEB
- https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3 WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.10.1 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-jj6c-8h6c-hppx ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |