# LiteLLM Proxy has server-side request forgery via the \`user_config\` request parameter

Advisory record · `GHSA-hx8v-g79f-8w5f`

- **Identifiers:** `GHSA-hx8v-g79f-8w5f` · `CVE-2026-59823` · `PYSEC-2026-4070`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 17 Sept 2026
- **Updated:** 1 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Sept 2026, 14:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `litellm` (PyPI): affected `<1.83.9`; fixed in `1.83.9`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> LiteLLM versions before 1.83.9 are affected by a server-side request forgery in the LiteLLM Proxy. An attacker holding a valid virtual key can place an api_base inside the user_config request body, which bypasses the existing guard and makes the proxy send requests to a host of their choosing, including internal ones. Upgrade litellm to 1.83.9 or later.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:09 UTC: First seen by agentprime
- 31 Oct 2026, 14:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-hx8v-g79f-8w5f)

## Sources

- [GitHub Advisory Database: GHSA-hx8v-g79f-8w5f](https://github.com/advisories/GHSA-hx8v-g79f-8w5f)
- [OSV: GHSA-hx8v-g79f-8w5f](https://osv.dev/vulnerability/GHSA-hx8v-g79f-8w5f)
- <https://github.com/BerriAI/litellm/security/advisories/GHSA-hx8v-g79f-8w5f>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-59823>
- <https://github.com/BerriAI/litellm/pull/25827>
- <https://github.com/BerriAI/litellm/commit/47214be317f45a2d2ac08258362e0481411eb427>
- <https://github.com/BerriAI/litellm>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-hx8v-g79f-8w5f>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-hx8v-g79f-8w5f/>. Everything for agents: <https://agentprime.io/llms.txt>.