CVE-2026-116173: vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to term

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-116173 is a medium-severity flaw (CVSS 5.9) affecting vllm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to terminate EngineCore by bypassing logprob_token_ids limits in the Rust gRPC frontend. Attackers can send Generate or GenerateStream requests with output_logprobs enabled and more than 128 output_candidates.token_ids, triggering a fatal sampler exception that crashes the engine.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-10-25
Last modified	2026-10-28

Publisher (CNA): VulnCheck · Vendor: vllm

Last updated 2026-10-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-25 14:16 UTCPublished CVE record published
2026-10-28 15:43 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-2026-116173?

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

Is CVE-2026-116173 being exploited?

CVE-2026-116173 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-2026-116173 affect?

CVE-2026-116173 affects vllm. Severity is medium (CVSS 5.9). vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to terminate EngineCore by bypassing logprob_token_ids limits in the Rust gRPC frontend. Attackers can send Generate or GenerateStream re

How urgent is CVE-2026-116173?

Priority 33/100. Remotely exploitable, no login, no user action

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References

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