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Vulnerability details: VCID-cgnq-9qen-6uh6
Vulnerability ID VCID-cgnq-9qen-6uh6
Aliases CVE-2026-42271
GHSA-v4p8-mg3p-g94g
Summary LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.74.2 to before version 1.83.7, 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. This issue has been patched in version 1.83.7.
Status Published
Exploitability None
Weighted Severity None
Risk None
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
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42271.json
epss 0.60784 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 Attend 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 Attend 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
cvssv3.1 8.8 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271
cvssv4 8.7 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271
generic_textual HIGH https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42271.json
https://api.first.org/data/v1/epss?cve=CVE-2026-42271
https://github.com/BerriAI/litellm
https://nvd.nist.gov/vuln/detail/CVE-2026-42271
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271
2467924 https://bugzilla.redhat.com/show_bug.cgi?id=2467924
GHSA-v4p8-mg3p-g94g https://github.com/advisories/GHSA-v4p8-mg3p-g94g
GHSA-v4p8-mg3p-g94g https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
v1.83.7-stable https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
Data source KEV
Date added June 8, 2026
Description BerriAI LiteLLM contains a command injection vulnerability that could allow any authenticated user, including holders of low-privilege internal-user keys, to run arbitrary commands on the host.
Required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Due date June 22, 2026
Note 
This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g ; https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable ; https://nvd.nist.gov/vuln/detail/CVE-2026-42271
Ransomware campaign use Unknown
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42271.json
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: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

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

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

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:T/P:M/B:A/M:M/D:A/2026-06-08T17:47:03Z/ 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:A/A:N/T:T/P:M/B:A/M:M/D:A/2026-06-08T17:47:03Z/ 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
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=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 0.98327
EPSS Score 0.60784
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:17.417825+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42271.json 38.6.0