Bug 2555868 (CVE-2026-112397)

Summary:	CVE-2026-112397 pillow: pillow: Denial of Service via out-of-bounds memory access on zero-width images
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	alinfoot, anpicker, anthomas, aprice, bbrownin, cmyers, dfreiber, dnakabaa, doconnor, drow, dschmidt, dtrifiro, ebourniv, ehelms, ggainey, hasun, ikhan, ilpinto, jburrell, jfula, jlanda, jmitchel, jowilson, jpasqual, jsamir, juwatts, jwong, kaycoth, kshier, lcouzens, ltomasbo, mdellweg, mhayden, mhulan, nmoumoul, nyancey, oezr, omaciel, ometelka, osousa, pcreech, ptisnovs, rbobbitt, rchan, rhel-process-autobot, sbunciak, sdoran, simaishi, smallamp, stcannon, syedriko, tmalecek, ttakamiy, vkumar, watson-tool-maintainers, weaton, xdharmai, yguenane, ykashtan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Pillow. A remote attacker can cause a Denial of Service (DoS) by supplying a specially crafted image with a width of zero to an application performing morphology operations. Because Pillow fails to validate zero-width image geometry during these operations, it attempts an out-of-bounds memory access before the buffer boundary, resulting in an application crash.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-10-19 21:22:29 UTC

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image. PPM and PGM input can create an image with width zero, and the native morphology routine indexes outrow[width - 1] without rejecting that geometry. An attacker can supply such an image to an application that applies a morphology operation. This can crash the process. This issue is fixed in version 13.0.0.