CVE-2026-116172: vLLM from 0.22.0 before 0.24.0 contains an improper input validation vulnerability in the Rust gRPC converter

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-116172 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 an improper input validation vulnerability in the Rust gRPC converter that allows remote attackers to bypass max_logprobs limits via CandidateTokens.top_n. Attackers can send Generate or GenerateStream requests with oversized or integer-wrapping top_n values to trigger torch.topk failures that terminate EngineCore.

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-2026-116172?

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

Is CVE-2026-116172 being exploited?

CVE-2026-116172 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-2026-116172 affect?

CVE-2026-116172 affects vllm. Severity is medium (CVSS 5.9). vLLM from 0.22.0 before 0.24.0 contains an improper input validation vulnerability in the Rust gRPC converter that allows remote attackers to bypass max_logprobs limits via CandidateTokens.top_n. Attackers can send Generate or GenerateStrea

How urgent is CVE-2026-116172?

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

Related CVEs

CVE-2026-116173 MEDIUM 5.9 UPGRADE vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to term
CVE-2026-116174 MEDIUM 5.9 UPGRADE vLLM from 0.22.0 before 0.24.0 contains an improper input validation vulnerability in the Rust gRPC Generate a
CVE-2026-116175 MEDIUM 6.5 UPGRADE vLLM from 0.19.0 before 0.24.0 contains a decompression bomb vulnerability because the AudioMediaIO multimodal
CVE-2026-116176 HIGH 8.2 UPGRADE vLLM from 0.9.2 before 0.24.0 contains a server-side request forgery vulnerability that allows API callers to
CVE-2026-116177 HIGH 7.5 UPGRADE vLLM from 0.10.2 before 0.25.0 contains an uncontrolled resource consumption vulnerability that allows unauthe

References

← Back to latest CVEs