Heap-based Buffer Overflow Affecting open-webui package, versions <0.11.0-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.13% (4th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-OPENWEBUI-18371896
  • published29 Jul 2026
  • disclosed9 May 2026

Introduced: 9 May 2026

CVE-2026-42309  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Chainguard open-webui to version 0.11.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream open-webui package and not the open-webui package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1