HTTP Response Splitting Affecting open-webui package, versions <0.8.12-r3


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.06% (18th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-OPENWEBUI-16078106
  • published16 Apr 2026
  • disclosed1 Apr 2026

Introduced: 1 Apr 2026

NewCVE-2026-34520  (opens in a new tab)
CWE-113  (opens in a new tab)

How to fix?

Upgrade Chainguard open-webui to version 0.8.12-r3 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.

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4.

CVSS Base Scores

version 3.1