HighVulnerabilityLLM-specific

CVE-2026-55514: vLLM crash via pure prompt embeds in /v1/completions requests

Source: NVD(opens in a new tab)
Identifier: CVE-2026-55514
Published: July 6, 2026
Record updated: October 9, 2026

Affected: vllm >= 0.12.0, < 0.24.0
Fixed in: 0.24.0
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.7%

Summary

CVE-2026-55514 affects vLLM, a library for LLM inference and serving, in versions from 0.12.0 to before 0.24.0. Sending a pure prompt embeds payload in a /v1/completions request to a model using M-RoPE makes EngineCore fail an assertion and crash, shutting down the entire server application. Any remote user authorized to make a /v1/completions request can trigger it.

Mitigation

This issue is fixed in version 0.24.0.

Details

Scores and exploitation

Patch available: Yes
EPSS: 0.7%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 13, 2026.
Disclosure date: July 6, 2026

Weaknesses and techniques

Weakness (CWE): CWE-617

Affected

Packages: vllm@>= 0.12.0, < 0.24.0 (fixed: 0.24.0)

Classification

Attack type: Denial of service
Attack sophistication: Trivial
AI component targeted: Inference
Impact: Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-55514

First tracked: July 6, 2026 at 08:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 95% (self-assessed)

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

vllmPyPILLM dependency since 2023-08-25 · 15 tracked dependents

Topics

Inference infrastructure

Summary

Mitigation

Affected packages in the Exposure Registry

Topics

Related items