Medium [CVE-2026-55514] Denial of Service via crafted prompt in /v1/completions request
This medium-severity Red Hat Linux advisory covers CVE-2026-55514 affecting Red Hat AI Inference Server 3.4, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI).
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
vLLM is a library for LLM inference and serving. From 0.12.0 to before 0.24.0, sending a pure prompt embeds payload in a /v1/completions request with a model using M-RoPE causes EngineCore to fail an assertion and fatally crash, shutting down the entire server application.
Any remote user who is authorized to make a /v1/completions request can make such a request and induce a crash. This issue is fixed in version 0.24.0.
A remote attacker, authorized to make a /v1/completions request, can send a specially crafted prompt embeds payload. This Moderate-impact flaw in vLLM, as used in Red Hat AI Inference Server, Red Hat OpenShift AI, and Red Hat Enterprise Linux AI, allows a remote, authenticated attacker to trigger a denial of service.
This issue requires prior authorization to make requests to the `/v1/completions` endpoint. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-617. Affected Red Hat products: Red Hat AI Inference Server 3.4; Red Hat AI Inference Server; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI).
Red Hat fixing advisory: RHSA-2026:83112, RHSA-2026:83114, RHSA-2026:83120, RHSA-2026:83121.
Is CVE-2026-55514 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-55514 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-55514?
Upgrade to a fixed release named by Red Hat:
- 0.24.0
- rhaii/vllm-cpu-rhel9:1791857301
- rhaii/vllm-spyre-rhel9:1791858592
- rhaii/vllm-cuda-rhel9:1791857183
- rhaii/vllm-rocm-rhel9:1791856725
- RHSA-2026:83112
- RHSA-2026:83114
- RHSA-2026:83120
- RHSA-2026:83121
Confirm against the vendor advisory before you patch.
- < 0.12.0
- < 0.24.0
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- 0.24.0
- rhaii/vllm-cpu-rhel9:1791857301
- rhaii/vllm-spyre-rhel9:1791858592
- rhaii/vllm-cuda-rhel9:1791857183
- rhaii/vllm-rocm-rhel9:1791856725
- RHSA-2026:83112
- RHSA-2026:83114
- RHSA-2026:83120
- RHSA-2026:83121
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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