GHSA-27h8-gf7j-v5hc: pillow (CVE-2026-112392)

Package	Ecosystem	Affected	Fixed in
pillow	PyPI	<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 before 13.0.0 crash when a median, minimum, maximum or rank filter is applied to an image with zero width or zero height; the crash is a NULL pointer dereference in ImagingExpand, which kills the whole Python process with SIGSEGV instead of raising an error. An attacker who can supply crop coordinates (such as a box with equal left and right edges) or an uploaded multi-page TIFF to an application running these filters can kill its worker process, with no memory disclosure or corruption. Upgrade to Pillow 13.0.0 or later, which fixes the issue.

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 8 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.