CVE-2026-40217

Name: CVE-2026-40217
Creator: NVD / NIST
Published: 2026-04-10T14:16:36.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2026-40217 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.72%

49.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-420

Affected Software

Vendor	Product	Versions
Litellm	Litellm	<= 2026-04-08

References

https://www.x41-dsec.de/lab/advisories/x41-2026-001-litellm/Exploit, Mitigation, Third Party Advisory

Timeline

Published: Apr 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is 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.

How severe is CVE-2026-40217?

CVE-2026-40217 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40217?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40217?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST