HTTP Response Splitting Affecting litellm package, versions <1.82.3.0-r3


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.06% (20th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LITELLM-15986537
  • published12 Apr 2026
  • disclosed1 Apr 2026

Introduced: 1 Apr 2026

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

How to fix?

Upgrade Chainguard litellm to version 1.82.3.0-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream litellm package and not the litellm 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