Medium6.5Red Hat Linux

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, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI).

CVE-2026-55514 Published Jul 6, 2026Updated by vendor Jul 6, 2026

CVE-2026-55514

Affected products & platforms

Red Hat LinuxUnclassified

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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; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI).

Red Hat does not currently list a fixing RHSA for this CVE.

Affected versions

< 0.12.0
< 0.24.0

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions

0.24.0

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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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