GHSA-fc9g-5qg7-mf45: pillow (CVE-2026-112891)

Package	Ecosystem	Affected	Fixed in
pillow	PyPI	>=9.2.0, <13.0.0	13.0.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Pillow versions from 9.2.0 before 13.0.0 are affected: when saving a GIF that has a long comment, the code repeatedly copies parts of the comment, including comments carried over from untrusted images. An attacker who can supply an image that a service then saves as a GIF could cause a denial of service through high CPU use, with impact depending on input size, concurrency, and worker CPU limits. Upgrade to Pillow 13.0.0 or later, which is listed as the fixed version.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0055, the 46th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.