CVE-2026-112891

Summary

Pillow: Quadratic GIF comment copying during save

Severity

medium

EPSS

0.5% (p41)

CWE

CWE-407

Also known as

GHSA-fc9g-5qg7-mf45

Published

2026-10-21

Updated

2026-10-21

Advisory details

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

• https://github.com/advisories/GHSA-fc9g-5qg7-mf45
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-fc9g-5qg7-mf45
• https://nvd.nist.gov/vuln/detail/CVE-2026-112891
• https://github.com/python-pillow/Pillow/commit/68a3fe957d8a4d552e8c69d96066d749f0614c7e
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0

Related advisories

• CVE-2026-112398 — critical · PyPI/pillow
• GHSA-78g4-xqwv-q3g8 — high · PyPI/pillow
• CVE-2026-96637 — high · PyPI/pillow
• CVE-2026-112892 — high · PyPI/pillow
• CVE-2026-112405 — high · PyPI/pillow
• CVE-2026-112893 — high · PyPI/pillow
• CVE-2026-112895 — high · PyPI/pillow
• CVE-2026-59205 — high · PyPI/pillow

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