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CVE-2026-116180high8.3

vLLM from 0.8.5 before 0.31.0 Cross-Tenant DoS via Uninitialized LogprobsTensors

Impact

vLLM versions 0.8.5 before 0.31.0 have a denial of service weakness due to an uninitialized LogprobsTensors allocation, allowing a client to crash EngineCore. A client can send specific requests to achieve this. The impact is a denial of service.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

vllm-project · VulnCheck

vllm

2 ranges
VulnCheck version evidence

Package identity

pkg:pypi/vllmExplore vllm →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0.8.5 → before 0.31.0

semver versions

unaffected

0.31.0

semver versions

unknown

Other versions: unaffected

Original source description

vLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector unwritten. A client sharing the engine can send prompt_logprobs (or echo with logprobs) against a connector-cached prefix, making tokenizer decode raise OverflowError, which crashes EngineCore and drops all co-tenant requests.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-116180

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-908 ↗

Use of Uninitialized Resource

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

From (inclusive): 0.8.5

Before: 0.31.0

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "0.8.5",
            "versionEndExcluding": "0.31.0"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-25
CISA-ADP

Additional data publisher

2026-10-26

What changed

Follow changes
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Large field values are marked as truncated previews. Original source snapshots remain retained.

References

2 sources
github.com/vllm-project/vllm/security/advisories/GHSA-rhcx-5729-88vg
vendor-advisoryVulnCheck
www.vulncheck.com/advisories/vllm-from-0.8.5-before-0.31.0-cross-tenant-dos-via-uninitialized-logprobstensors
third-party-advisoryVulnCheck