Pillow: Quadratic GIF comment copying during save
GHSA-fc9g-5qg7-mf45 · BIT-pillow-2026-112891 · CVE-2026-112891
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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.
References
- WEB https://github.com/python-pillow/Pillow/security/advisories/GHSA-fc9g-5qg7-mf45
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-112891
- WEB https://github.com/python-pillow/Pillow/commit/68a3fe957d8a4d552e8c69d96066d749f0614c7e
- PACKAGE https://github.com/python-pillow/Pillow
- WEB https://github.com/python-pillow/Pillow/releases/tag/13.0.0
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