vLLM up to 0.22.1 OPUS File /v1/audio/transcriptions data amplification

Summaryinfo

A vulnerability was found in vLLM. It has been classified as problematic. This affects an unknown part of the file /v1/audio/transcriptions of the component OPUS File Handler. Performing a manipulation results in data amplification. This vulnerability is known as CVE-2026-54233. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in vLLM. This affects an unknown code block of the file /v1/audio/transcriptions of the component OPUS File Handler. The manipulation with an unknown input leads to a data amplification vulnerability. CWE is classifying the issue as CWE-409. The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-54233 since 06/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 0.23.1rc0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• vLLM

Version

• 0.7.0
• 0.7.2
• 0.8.0
• 0.8.5
• 0.9.0
• 0.10.1.1
• 0.10.3
• 0.11.1
• 0.12.0
• 0.13.0
• 0.14.0
• 0.14.1
• 0.17.0
• 0.18.0
• 0.19.0
• 0.20.0
• 0.22.0
• 0.22.1

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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