Server-Side Request Forgery in vLLM by VLLM Project
CVE-2026-116176

8.8HIGH

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
25 October 2026

What is CVE-2026-116176?

The vLLM project versions prior to 0.24.0 are susceptible to a server-side request forgery (SSRF) vulnerability. This flaw enables API users to execute outbound network connections by inserting a malicious decode address into the X-Request-Id header. This manipulation allows attackers to exploit the P2pNcclConnector component to connect to an attacker-controlled host, potentially exposing sensitive information such as NCCL unique identifiers and KV-cache tensors, or even leading to undesired blocking of the worker processes.

Affected Version(s)

vllm 0.9.2 < 0.24.0

vllm 0.24.0

References

https://github.com/vllm-project/vllm/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/vllm-0.9.2-before-0....
third-party-advisory

CVSS V4

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

mschwarzl
jperezdealgaba
.