CVE-2026-55646: vLLM is an inference and serving engine for large language models

Routine

MEDIUM 6.5UPGRADE

CVE-2026-55646 is a medium-severity flaw (CVSS 6.5) affecting vllm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

vLLM is an inference and serving engine for large language models. From 0.22.0 to 0.23.0, the /v1/audio/transcriptions and /v1/audio/translations routes call request.file.read() to fully materialize an uploaded audio file into memory before vLLM checks the documented VLLM_MAX_AUDIO_CLIP_FILESIZE_MB compressed upload size limit (default 25 MB) later in the speech-to-text preprocessing step, so an API caller who can reach those routes can submit an

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2026-07-06
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: vllm

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 20:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

vllm vllm UPGRADE

Affected: >= 0.22.0 and < 0.24.0

Fixed in: 0.24.0

Safe to downgrade to: a release before 0.22.0

1. Check installed version

apt-cache policy vllm || rpm -q vllm || vllm --version

2. UPGRADE to 0.24.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vllm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vllm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.22.0 (Debian / Ubuntu)

apt-cache madison vllm sudo apt install vllm=<VERSION_BEFORE_0.22.0> sudo apt-mark hold vllm

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list vllm sudo dnf downgrade vllm-<VERSION_BEFORE_0.22.0> sudo dnf versionlock add vllm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55646?

vllm: upgrade to 0.24.0. Exact commands for each OS are on this page.

Is CVE-2026-55646 being exploited?

CVE-2026-55646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55646 affect?

CVE-2026-55646 affects vllm. Severity is medium (CVSS 6.5). vLLM is an inference and serving engine for large language models. From 0.22.0 to 0.23.0, the /v1/audio/transcriptions and /v1/audio/translations routes call request.file.read() to fully materialize an uploaded audio file into memory before

How urgent is CVE-2026-55646?

Priority 34/100. No elevated risk signals yet.

Related CVEs

CVE-2026-54234 HIGH 7.5 UPGRADE vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs
CVE-2026-55574 HIGH 7.5 UPGRADE vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs
CVE-2026-55514 MEDIUM 6.5 UPGRADE vLLM is a library for LLM inference and serving
CVE-2026-56340 HIGH 8.8 UPGRADE vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing
CVE-2026-73560 MEDIUM 6.5 UPGRADE vLLM is an inference and serving engine for large language models

References

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