GHSA-22hg-r758-rrw9: pillow (CVE-2026-112390)

Package	Ecosystem	Affected	Fixed in
pillow	PyPI	>=7.2.0, <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 7.2.0 before 13.0.0 are affected when the optional olefile package is installed. A crafted, roughly 5.6 KB Microsoft Image Composer file, with no extension needed, makes reading the n_frames property loop forever at 100% CPU. An application must open an untrusted image and then check n_frames, for example to test whether it is animated or to re-save with save_all=True, to be affected. Only an external watchdog can stop the hang, since no exception is raised and memory does not grow. Upgrade to Pillow 13.0.0, where this is fixed.

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
8.2	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0059, the 48th 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.