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Vulnerability record · CVE-2026-34760 · published 2 April 2026

CVE-2026-34760: Vllm improper input validation vulnerability

Vllm · Vllm

vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before version 0.18.0, Librosa defaults to using numpy.mean for mono downmixing (to_mono), while the international standard ITU-R BS.775-4 specifies a weighted downmixing algorithm. This discrepancy results in inconsistency between audio heard by humans (e.g., through headphones/regular speakers) and audio processed by AI models (Which infra via Librosa, such as vllm, transformer). This issue has been patched in version 0.18.0.

7.1 CVSS 3.1 High EPSS 0.48% · top 61.3% CWE-20 · Improper input validation
7.1CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
24 Jul 2026Last modified by NVD

Description

vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before version 0.18.0, Librosa defaults to using numpy.mean for mono downmixing (to_mono), while the international standard ITU-R BS.775-4 specifies a weighted downmixing algorithm. This discrepancy results in inconsistency between audio heard by humans (e.g., through headphones/regular speakers) and audio processed by AI models (Which infra via Librosa, such as vllm, transformer). This issue has been patched in version 0.18.0.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vllm-project/vllm/commit/c7f98b4d0a63b32ed939e2b6dfaa8a626e9b46c4 Patch
https://github.com/vllm-project/vllm/pull/37058 Issue Tracking
https://github.com/vllm-project/vllm/releases/tag/v0.18.0 Release Notes
https://github.com/vllm-project/vllm/security/advisories/GHSA-6c4r-fmh3-7rh8 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34760), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.