GHSA-7mwm-ghpf-9vrm: pillow (CVE-2026-112402)

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 are affected by a double free in ImagingScaleAffine, reached through Image.transform() with the default NEAREST resampling when the output is very wide and a memory limit makes the per-column lookup table allocation fail. An attacker who can choose the output size of Image.transform() on a worker with an address-space limit (or a 32-bit process) can crash the process, and the heap corruption may not be fully controllable. Upgrade to Pillow 13.0.0 or later, which contains the fix. The source gives few details on the attacker-controlled data an exploit could write.

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
8.7	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/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.