Medium 6.5Published Oct 26, 2026

CVE-2026-115913vLLM: Phi-4 multimodal audio encoder materializes and retains full attention matrices: a single max-length audio OOM-crashes the vLLM engine

Updated under an hour ago (Oct 29, 2026, 4:30 PM ET)

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It affects vllm-project vllm and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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vLLM is an inference and serving engine for large language models. Prior to 0.32.0, the Phi-4 multimodal audio encoder in phi4mm_audio.py and phi4mm_utils.py uses eager attention by default, allowing a remote client to submit one legal long audio clip that causes MultiHeadedAttention.forward_attention to materialize and retain full attention matrices in self.attn. The scaled dot-product attention branch does not materialize these matrices. The resulting quadratic GPU-memory use can cause an out-of-memory condition and terminate EngineCore for all users. This issue is fixed in version 0.32.0.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

vllm-project vllm vllm_project:vllm (from the name)	before 0.32.0	CNA record
vllm vllm vllm:vllm	from 0.31.0 before 0.32.0	NVD

References

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-8397-8qf6-f2gm	x-refsource-confirm, exploit, patch, vendor-advisory
https://github.com/vllm-project/vllm/pull/60614	x-refsource-misc, patch
https://github.com/vllm-project/vllm/commit/3d52578e13454de0bb8352cac988347cdcc89928	x-refsource-misc, patch
https://github.com/vllm-project/vllm/releases/tag/v0.32.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.