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VulnerabilityPublished Updated

CVE-2026-40217: BerriAI LiteLLM · Unprotected Alternate Channel

Affects BerriAI LiteLLMSource CVE Database V5

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Not known to be exploited · public detection template (Nuclei) · 15% EPSS · CVSS 8.8 High.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
15.5% chance of exploitation in 30 days – higher than 96% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Apr 2026

  2. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
BerriAILiteLLMAffected
  • =bb0639701796218a3447160e55c0f1097446e4e6085df7dfd39f476d4143743f
Fixed in–

AI-suggested

Red Hat has published advisories referencing CVE-2026-40217, indicating that updates or fixes may be available through Red Hat errata. Users should monitor the referenced Red Hat advisories (https://access.redhat.com/security/cve/CVE-2026-40217, https://access.redhat.com/errata/RHSA-2026:24866, https://access.redhat.com/errata/RHSA-2026:30056) for official patches or updates. Until a patch is applied, restrict access to the vulnerable URI endpoint (/guardrails/test_custom_code) if possible to mitigate risk.

Description

LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI.

References

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