GHSA-jg86-v3jv-hrpm: pillow (CVE-2026-112894)

Package	Ecosystem	Affected	Fixed in
pillow	PyPI	>=5.1.0, <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 5.1.0 up to, but not including, 13.0.0 have a quadratic-time slowdown in the PDF writer when saving a multi-frame image with save_all=True, because the next free object id is recomputed by scanning every id reserved so far. An attacker who can get an application to convert an uploaded image to PDF this way can hold a worker at full CPU for minutes with a small file; for APNG, a 125-byte file declaring a large frame count triggers the same slowdown. The fix is to upgrade to Pillow 13.0.0.

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 5 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.