GHSA-q45j-58j2-45rg: pillow (CVE-2026-112897)

Package	Ecosystem	Affected	Fixed in
pillow	PyPI	>=5.3.0, <13.0.0	13.0.0

Machine-written summary

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

Pillow (PyPI) versions 5.3.0 up to but not including 13.0.0 can return uninitialized heap memory as image pixels when decoding a small crafted TIFF with JPEG or Group 4 fax compression. An attacker who can get an application to open their image, and can see output derived from its pixels such as a thumbnail or converted copy, could read previously freed process memory. The issue is fixed in Pillow 13.0.0, so upgrade to that version or later.

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:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0048, the 41st 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.