What is CVE-2026-40217?

CVE-2026-40217 is a high-severity vulnerability in Berriai Litellm, classified under Unprotected Alternate Channel. CVSS score: 8.8/10. Published 2026-04-10.

How severe is CVE-2026-40217?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2026-40217 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Berriai Litellm

CVE-2026-40217

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

Published 2026-04-10 · last modified 2026-07-15.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.034 (88.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.151 · newest: 0.034 · change: -0.117

Affected products

Berriai Litellm — versions bb0639701796218a3447160e55c0f1097446e4e6085df7dfd39f476d4143743f
Litellm

Weakness classification (CWE)

Public proof-of-concept exploits

learner202649/CVE-2026-40217-PoC

References

www.x41-dsec.de/lab/advisories/x41-2026-001-litellm/ (Exploit, Third Party Advisory, Mitigation)
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Frequently asked questions

What is CVE-2026-40217?: CVE-2026-40217 is a high-severity vulnerability in Berriai Litellm, classified under Unprotected Alternate Channel. CVSS score: 8.8/10. Published 2026-04-10.
How severe is CVE-2026-40217?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2026-40217 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.