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CVE-2026-57173— vLLM: Unauthenticated audio decompression-bomb DoS in /v1/chat/completions

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 是一个用于大语言模型的推理和服务引擎。在 0.24.0 版本之前，/v1/chat/completions 接口在处理 input_audio 参数时，调用 AudioMediaIO.load_bytes 或 AudioMediaIO.load_file 方法时，未将 VLLM_MAX_AUDIO_DECODE_DURATION_S 参数传递给共享的音频解码器。因此，未认证的攻击者可以提交一个体积较小的压缩音频输入，使其在解码后展开为极其庞大的 float32 格式 PCM 内存分配，从而绕过 /v1/a

CVSS 6.5 · Medium EPSS 0.73% · P54

Possible ATT&CK Techniques 1 AI

T1522

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm < 0.24.0 affected
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I. Basic Information for CVE-2026-57173

Vulnerability Information
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Vulnerability Title
vLLM: Unauthenticated audio decompression-bomb DoS in /v1/chat/completions
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models. Prior to 0.24.0, the input_audio handling path for /v1/chat/completions calls AudioMediaIO.load_bytes or AudioMediaIO.load_file without passing VLLM_MAX_AUDIO_DECODE_DURATION_S to the shared audio decoder. An unauthenticated client can therefore submit a small compressed audio input that expands into a very large float32 PCM allocation, bypassing the duration guard already used by /v1/audio/transcriptions and causing an out-of-memory worker crash. Inline data URLs reach this path without being bounded by VLLM_AUDIO_FETCH_TIMEOUT. The issue affects deployments serving an audio-capable model, and authentication changes only the deployment-specific reachability. This issue is fixed in version 0.24.0.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm < 0.24.0 -

II. Public POCs for CVE-2026-57173

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III. Intelligence Information for CVE-2026-57173

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Patches & Fixes for CVE-2026-57173 (2)

Other References for CVE-2026-57173 (2)

Same Patch Batch · vllm-project · 2026-09-16 · 4 CVEs total

CVE-2026-69147 6.5 MEDIUM vLLM: Request-selected PyNvVideoCodec GPU decode bypasses static VRAM reservation
CVE-2026-92220 5.3 MEDIUM vllm-project vLLM MoRIIO Acknowledgement moriio_connector.py MoRIIOWrapper._handle_release
CVE-2026-92365 4.3 MEDIUM vllm-project vllm thinking_budget_state.py algorithmic complexity

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-770