CVE-2026-44223

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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., "repetition_penalty": 1.1) is sufficient to crash the server. This vulnerability is fixed in 0.20.0.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
29.2%
KEV
Not listed

Published

May 12, 2026

Last Modified

June 22, 2026

Advisory Details (2)

Auto-updated May 15, 2026
Patch available. Sources: github.
github Patch Available

extract_hidden_states speculative decoding crashes server on any request with penalty parameters · Advisory · vllm-project/vllm · GitHub

https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw
generic

[Spec Decode] fix returning size mismatch on extract hidden states proposer by zzaebok · Pull Request #38610 · vllm-project/vllm · GitHub

https://github.com/vllm-project/vllm/pull/38610

Vendor Advisories for CVE-2026-44223(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
vllm0.18.0, 0.18.1, 0.19.0, 0.19.10.20.0—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:14 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
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  9. 2026-07-16 00:53 UTCOSV refresh
  10. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-28 04:56 UTCEPSS rescore
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  3. 2026-06-25 13:49 UTCEPSS rescore
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  18. 2026-06-13 23:00 UTCEPSS rescore
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  22. 2026-06-10 22:18 UTCEPSS rescore
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  43. 2026-05-29 13:44 UTCEPSS rescore
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  45. 2026-05-28 13:44 UTCEPSS rescore
  46. 2026-05-28 13:44 UTCEPSS rescore
  47. 2026-05-27 13:40 UTCEPSS rescore
  48. 2026-05-27 13:40 UTCEPSS rescore
  49. 2026-05-26 13:44 UTCEPSS rescore
  50. 2026-05-26 07:18 UTCEPSS rescore
  51. 2026-05-21 22:43 UTCEPSS rescore
  52. 2026-05-20 22:38 UTCEPSS rescore
  53. 2026-05-20 12:42 UTCEG score recompute
  54. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44223?
CVE-2026-44223 is a medium vulnerability published on May 12, 2026. vLLM is an inference and serving engine for large language models (LLMs). From 0.18.0 to before 0.20.0, the extracthiddenstates 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…
When was CVE-2026-44223 disclosed?
CVE-2026-44223 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44223 actively exploited?
CVE-2026-44223 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44223?
CVE-2026-44223 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-44223?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44223, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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