Bug 2468458 (CVE-2026-42309)

Summary: CVE-2026-42309 Pillow: Pillow: Denial of Service via specially crafted coordinate input
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: alinfoot, anpicker, anthomas, bbrownin, bdettelb, cmyers, derez, dfreiber, dnakabaa, doconnor, drow, dschmidt, dtrifiro, ehelms, erezende, ggainey, hasun, jburrell, jfula, jkoehler, jlanda, jmitchel, jowilson, juwatts, jwong, kaycoth, kshier, lcouzens, lphiri, mhulan, nmoumoul, nyancey, omaciel, ometelka, osousa, pcreech, ptisnovs, rbryant, rchan, rhel-process-autobot, simaishi, smallamp, smcdonal, stcannon, syedriko, teagle, tmalecek, ttakamiy, vkumar, watson-tool-maintainers, weaton, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Pillow, a Python imaging library. A malicious actor could exploit this vulnerability by providing specially crafted nested lists as coordinates to image processing APIs within Pillow. This could lead to a heap buffer overflow, potentially causing a denial of service in applications using the library.
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Description OSIDB Bzimport 2026-05-09 06:01:34 UTC 
Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.