CVE-2026-116176 vllm-project CVE debrief

Who should care

Defenders responsible for systems using vLLM versions from 0.9.2 before 0.24.0 should assess exposure and apply the patch to prevent potential SSRF attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the vLLM version in use and review API caller permissions to limit access to sensitive functionality.

Why it matters

Defenders should care about CVE-2026-116176 because it represents a server-side request forgery vulnerability in vLLM that could lead to sensitive information leakage or worker blocking. The vulnerability requires verification of the vLLM version and application of patches to prevent exploitation.

• Potential leakage of sensitive information due to forced outbound connections.
• Possible blocking of workers due to malicious API calls.
• Need for verification of vLLM version in use and application of patches.
• Potential for attackers to exploit this vulnerability for further malicious activities.

Technical summary

The vulnerability exists in vLLM versions from 0.9.2 before 0.24.0 and allows API callers to force outbound connections by embedding a decode address in the X-Request-Id header. This could potentially lead to the leakage of sensitive information or blocking of workers. The vulnerability requires verification of the vLLM version and application of patches to prevent exploitation. Defenders should prioritize verifying the version of vLLM in use and applying the patch to prevent potential SSRF attacks. Affected systems should be reviewed for exposure, and patches should be applied to prevent potential SSRF attacks.

Defensive priority

Defenders should prioritize verifying the version of vLLM in use and applying the patch to prevent potential SSRF attacks.

Recommended defensive actions

• Verify the version of vLLM in use and apply the patch to prevent potential SSRF attacks.
• Review API caller permissions and limit access to sensitive functionality.
• Monitor for suspicious outbound connections from affected systems.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The vulnerability was reported in the source item PYSEC-2026-4351, which details the server-side request forgery vulnerability in vLLM. The CVE Program and NVD records provide additional context. The source item provides details on the vulnerability, but the scope of affected systems and specific exploitation methods are not detailed. Defenders should verify the vLLM version in use and review API caller permissions to limit access to sensitive functionality.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.