CVE-2026-54233: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in vllm-project vllm
vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.23.1rc0, vLLM's /v1/audio/transcriptions endpoint limits compressed upload size but not decoded PCM output. A 25MB OPUS file expands to ~14.9GB of float32 PCM at decode time. This vulnerability is fixed in 0.23.1rc0.
AI Analysis
Technical Summary
The vulnerability in vLLM before 0.23.1rc0 involves improper handling of highly compressed audio data at the /v1/audio/transcriptions endpoint. While the endpoint limits the size of the compressed OPUS upload (e.g., 25MB), it does not limit the size of the decoded PCM output, which can expand to approximately 14.9GB of float32 PCM data. This data amplification can lead to resource exhaustion and denial of service conditions. The vulnerability is identified as CWE-409 (Improper Handling of Highly Compressed Data) and has a CVSS 3.1 base score of 6.5 (medium severity). The issue is fixed in vLLM version 0.23.1rc0.
Potential Impact
An attacker can upload a moderately sized compressed audio file that decompresses into a very large amount of memory usage, potentially causing denial of service by exhausting system resources. There is no confidentiality or integrity impact reported. The main impact is availability degradation due to resource exhaustion.
Mitigation Recommendations
Upgrade to vLLM version 0.23.1rc0 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 0.23.1rc0, applying this update remediates the issue. No other mitigation is indicated.
CVE-2026-54233: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in vllm-project vllm
Description
vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.23.1rc0, vLLM's /v1/audio/transcriptions endpoint limits compressed upload size but not decoded PCM output. A 25MB OPUS file expands to ~14.9GB of float32 PCM at decode time. This vulnerability is fixed in 0.23.1rc0.
CVSS v3.1
Score 6.5medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in vLLM before 0.23.1rc0 involves improper handling of highly compressed audio data at the /v1/audio/transcriptions endpoint. While the endpoint limits the size of the compressed OPUS upload (e.g., 25MB), it does not limit the size of the decoded PCM output, which can expand to approximately 14.9GB of float32 PCM data. This data amplification can lead to resource exhaustion and denial of service conditions. The vulnerability is identified as CWE-409 (Improper Handling of Highly Compressed Data) and has a CVSS 3.1 base score of 6.5 (medium severity). The issue is fixed in vLLM version 0.23.1rc0.
Potential Impact
An attacker can upload a moderately sized compressed audio file that decompresses into a very large amount of memory usage, potentially causing denial of service by exhausting system resources. There is no confidentiality or integrity impact reported. The main impact is availability degradation due to resource exhaustion.
Mitigation Recommendations
Upgrade to vLLM version 0.23.1rc0 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 0.23.1rc0, applying this update remediates the issue. No other mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-12T16:25:43.084Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39b9b1eed863c81e85ffa7
Added to database: 06/22/2026, 22:39:45 UTC
Last enriched: 06/22/2026, 22:54:24 UTC
Last updated: 08/06/2026, 12:41:11 UTC
Views: 191
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