GHSA-fc9g-5qg7-mf45
Pillow: Quadratic GIF comment copying during save
At a glance
- Published
- Updated
- CVE
- CVE-2026-112891
- Aliases
- BIT-pillow-2026-112891
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
On Pillow 12.3.0 and upstream `main` (`ad277e2761b489681e71b51e91367d46b0ceabb9`), a GIF with a long comment makes `_get_global_header()` copy portions of the comment repeatedly when saving, including comments carried over from untrusted images. I suggest provisional **Moderate** severity for crafted-image CPU denial of service, with CVSS-B 6.9 assuming a network service automatically opens unauthenticated uploads and they are resaved as GIFs; impact depends on input-size, concurrency, and worker CPU limits.
Affected packages
| Package | Versions |
|---|---|
| PyPI · pillow | introduced 9.2.0, fixed 13.0.0 |
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-fc9g-5qg7-mf45 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-112891 ADVISORY
- https://github.com/python-pillow/Pillow/commit/68a3fe957d8a4d552e8c69d96066d749f0614c7e WEB
- https://github.com/python-pillow/Pillow PACKAGE
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |