Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / vllm/PYSEC-2026-4351
Advisory ID pypa/vllm/PYSEC-2026-4351
Aliases CVE-2026-116176
GHSA-vfp2-c8pq-v6h6
PYSEC-2026-4351
Summary vLLM from 0.9.2 before 0.24.0 contains a server-side request forgery vulnerability that allows API callers to force outbound connections by embedding a decode address in the X-Request-Id header. Attackers can make a P2pNcclConnector prefill worker ZMQ-connect to an attacker host, leaking the NCCL unique_id and KV-cache tensors or blocking the worker.
Status Published
Exploitability 0.5
Weighted Severity 7.4
Risk 3.7
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 8.2 https://github.com/pypa/advisory-database/blob/main/vulns/vllm/PYSEC-2026-4351.yaml
Reference id Reference type URL
https://github.com/vllm-project/vllm/security/advisories/GHSA-vfp2-c8pq-v6h6
https://www.vulncheck.com/advisories/vllm-0.9.2-before-0.24.0-ssrf-via-x-request-id-in-p2pncclconnector
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L Found at https://github.com/pypa/advisory-database/blob/main/vulns/vllm/PYSEC-2026-4351.yaml
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

There are no SSVC decisions available.