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Vulnerability details: VCID-1yds-ecc9-qubt
Vulnerability ID VCID-1yds-ecc9-qubt
Aliases CVE-2026-42271
GHSA-v4p8-mg3p-g94g
Summary LiteLLM: Authenticated command execution via MCP stdio test endpoints ### Impact Two endpoints used to preview an MCP server before saving it — `POST /mcp-rest/test/connection` and `POST /mcp-rest/test/tools/list` — accepted a full server configuration in the request body, including the `command`, `args`, and `env` fields used by the stdio transport. When called with a stdio configuration, the endpoints attempted to connect, which spawned the supplied command as a subprocess on the proxy host with the privileges of the proxy process. The endpoints were gated only by a valid proxy API key, with no role check. Any authenticated user — including holders of low-privilege internal-user keys — could therefore run arbitrary commands on the host. ### Patches Fixed in **`1.83.7`**. Both test endpoints now require the `PROXY_ADMIN` role, bringing them into line with the save endpoint. ### Workarounds If upgrading is not immediately possible, developers should block `POST /mcp-rest/test/connection` and `POST /mcp-rest/test/tools/list` at their reverse proxy or API gateway.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.04116 https://api.first.org/data/v1/epss?cve=CVE-2026-42271
cvssv3.1 8.8 https://github.com/BerriAI/litellm
cvssv4 8.7 https://github.com/BerriAI/litellm
generic_textual HIGH https://github.com/BerriAI/litellm
cvssv3.1 8.8 https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
cvssv4 8.7 https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
generic_textual HIGH https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
ssvc Track https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
cvssv3.1 8.8 https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
cvssv4 8.7 https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
generic_textual HIGH https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
ssvc Track https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2026-42271
cvssv4 8.7 https://nvd.nist.gov/vuln/detail/CVE-2026-42271
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-42271
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42271
https://github.com/BerriAI/litellm
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
https://nvd.nist.gov/vuln/detail/CVE-2026-42271
GHSA-v4p8-mg3p-g94g https://github.com/advisories/GHSA-v4p8-mg3p-g94g
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/BerriAI/litellm
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N Found at https://github.com/BerriAI/litellm
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

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passive

active

high

low

none

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low

none

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none

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low

none

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low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N Found at https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

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low

none

high

low

none

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low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-08T14:30:57Z/ Found at https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N Found at https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-08T14:30:57Z/ Found at https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42271
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42271
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.8883
EPSS Score 0.04116
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:51:37.800101+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-v4p8-mg3p-g94g/GHSA-v4p8-mg3p-g94g.json 38.6.0