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CVE-2026-105757— vLLM: Structured-output request errors escape the request boundary and terminate the shared EngineCore — engine-fatal denial of service (3 sites)

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vLLM 是一个用于大型语言模型的推理和服务引擎。在 0.30.0 版本之前，结构化输出请求的失败可能绕过请求级别的验证，进而触发 EngineCore 中的致命错误路径。具体的漏洞场景包括： 每个请求的后端不匹配可能导致重新抛出语法编译异常； 由 ngram_gpu 推测解码模式生成的填充可能向引导验证传入负数 token； Rust 前端可能接受 Python 前端所拒绝的空结构化输出值。 这些缺陷使得普通的约束生成请求能够终止共享引擎。该问题已在 0.30.0 版本中得到修复。

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-105757

Vulnerability Information
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Vulnerability Title
vLLM: Structured-output request errors escape the request boundary and terminate the shared EngineCore — engine-fatal denial of service (3 sites)
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models. Prior to 0.30.0, structured-output request failures can escape request-scoped validation and reach the EngineCore fatal-error path. A per-request backend mismatch can re-raise a grammar compilation exception, padding produced by the ngram_gpu speculative-decoding mode can pass a negative token to guidance validation, and the Rust frontend can admit empty structured-output values that the Python frontend rejects, allowing ordinary constrained-generation requests to terminate the shared engine. This issue is fixed in version 0.30.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm < 0.30.0 -

II. Public POCs for CVE-2026-105757

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III. Intelligence Information for CVE-2026-105757

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Other References for CVE-2026-105757 (4)

Same Patch Batch · vllm-project · 2026-10-05 · 9 CVEs total

CVE-2026-105753 6.5 MEDIUM vLLM: Mirrored multimodal IPC caches desync after a rejected request — a later request reu
CVE-2026-105754 6.5 MEDIUM vLLM: Scale-out disaggregated multimodal transport trusts caller-supplied features
CVE-2026-105756 6.5 MEDIUM vLLM: Loose `cache_salt` validation lets a single request kill EngineCore on LMCache-MP de
CVE-2026-105759 5.9 MEDIUM vLLM: Unbounded Prometheus label cardinality from attacker-controlled HTTP method tokens i
CVE-2026-105760 5.3 MEDIUM vLLM: GLMGA video sampling permits request-driven CPU and memory exhaustion
CVE-2026-105758 5.3 MEDIUM vLLM: Qwen2-VL / Qwen3-VL video samplers bound on request-controlled max_frames, which the
CVE-2026-105755 4.2 MEDIUM vLLM: Flash late-interaction scoring caches query embeddings under a caller-controlled req
CVE-2026-105752 3.1 LOW vLLM: Harmony tool continuations drop `cache_salt` — restoring a cross-tenant prefix-cache

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-20

V. Comments for CVE-2026-105757

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