GHSA-254f-3936-288h: pillow (CVE-2026-112391)

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 before 13.0.0 are affected through the PdfParser class, where the get_value() method can recurse without limit on deeply nested PDF objects and raise an uncaught RecursionError. An attacker who controls an existing PDF that an application appends an image page to, using Image.save with format="PDF" and append=True, can crash that operation with a small file; the source reports no confidentiality or integrity impact. Upgrade to Pillow 13.0.0 or later, which is the listed fixed version.

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

CISA KEV Not listed.
EPSS 0.0058, the 47th 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.