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CVE-2026-44223

vLLM is an inference and serving engine for large language models (LLMs). From 0.18.0 to before 0.20.0, the extract_hidden_states speculative decoding proposer in vLLM returns a tensor with an incorrect shape after the first decode step, causing a RuntimeError that crashes the EngineCore process. The crash is triggered when any request in the batch uses sampling penalty parameters (repetition_penalty, frequency_penalty, or presence_penalty). A single request with a penalty parameter (e.g., "repe
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fe891e20d42aa6bfc1a5e552490b5666cdf4ef03e0349c47d0e30a31ac7f1847
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-704","description":"CWE-704: Incorrect Type Conversion or Cast","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-131","description":"CWE-131: Incorrect Calculation of Buffer Size","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"vllm","vendor":"vllm-project","versions":[{"status":"affected","version":">= 0.18.0, < 0.20.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-704","description":"CWE-704: Incorrect Type Conversion or Cast","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-131","description":"CWE-131: Incorrect Calculation of Buffer Size","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/vllm-project/vllm/pull/38610","tags":["x_refsource_MISC"],"url":"https://github.com/vllm-project/vllm/pull/38610"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/vllm-project/vllm/pull/38610"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/adp/0/references/1
{"tags":["exploit"],"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/adp/0/references/0
{"name":"https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f7b2f3c5f19a0ffb715a4c49c59dc51632ae18f836de826cee15bbca6d4d40a · sha256:4b08eec1c10b757f… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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