Medium 5.3Published Sep 16, 2026

CVE-2026-59823LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy

Updated under an hour ago (2026-10-19 07:23 UTC)

Does this affect you?

It affects BerriAI litellm. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for BerriAI litellm

Exploited in the last 30 days

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.9, an authenticated LiteLLM Proxy caller with a valid virtual key can place api_base inside the user_config request body to bypass is_request_body_safe, which blocks top-level api_base and base_url but previously did not inspect or reject user_config. Because user_config constructs the outbound router, the nested destination redirects a server-side request to an internal or external host selected by the caller and can expose endpoints the caller cannot otherwise access. This issue is fixed in version 1.83.9.

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

BerriAI litellm berriai:litellm (from the name)	before 1.83.9	CNA record

References

https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5fx-refsource-confirm
https://github.com/BerriAI/litellm/pull/25827x-refsource-misc
https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.