CVE-2026-100651

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-26. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-87745 (ENISA EUVD) · GHSA-g43f-v3gj-45x5 (GitHub Security Advisories)Source: ENISA EUVD

6.5EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists vllm-project vllm versions before 0.29.0 as affected, and vllm-project vllm versions 0.29.0 as unaffected. No release containing a fix is confirmed on record.

vLLM before 0.29.0 fails to enforce decoder prompt-length validation on the disaggregated serving endpoint /inference/v1/generate. When the request contains a 'features' (multimodal) payload, vllm/entrypoints/serve/disagg/serving.py builds a multimodal EngineInput directly from the caller-supplied token_ids, and GenerateRequest.token_ids (vllm/entrypoints/serve/disagg/protocol.py) is not checked against model_config.max_model_len. For multimodal processors that report skip_prompt_length_check=True (for example Nemotron Parse, Whisper, and FireRedLID), InputProcessor._validate_prompt_len() returns immediately for both encoder and decoder prompts, so an overlong prompt becomes an EngineCoreRequest and reaches the worker input-batch copy into a fixed max_model_len-wide NumPy row. A client able to reach the endpoint on an affected model configuration can therefore submit an overlong token_ids list to trigger a worker failure and denial of service. Fixed in 0.29.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 26, 2026

Last Modified

October 6, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
No fix on record yet. Sources: github.
Web page

vllm before 0.29.0 Denial of Service via Decoder Prompt Length Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vllm-before-0.29.0-denial-of-service-via-decoder-prompt-length-bypass
GitHub advisoryMentions a patch (unverified)

Disaggregated generate skips decoder prompt-length validation for some multimodal processors · Advisory · vllm-project/vllm · GitHub

https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9

Vendor Advisories for CVE-2026-100651(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 56× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  7. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  8. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-26 15:33 UTCEG score recompute
  10. 2026-10-26 15:33 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  11. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-10-25 15:58 UTCEG score recompute
  13. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  14. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  15. 2026-10-23 09:53 UTCEG score recompute
  16. 2026-10-23 09:53 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  17. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-10-18 05:11 UTCEG score recompute
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 56 more
  1. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-12 16:41 UTCEG score recompute
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  5. 2026-10-12 00:49 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  6. 2026-10-11 20:16 UTCEG score recompute
  7. 2026-10-11 18:29 UTCEG score recompute
  8. 2026-10-11 15:02 UTCEG score recompute
  9. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-10 23:41 UTCEG score recompute
  11. 2026-10-10 23:41 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  12. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-10-09 22:41 UTCEG score recompute
  14. 2026-10-09 22:41 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  15. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-08 21:46 UTCEG score recompute
  17. 2026-10-08 21:46 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  18. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-10-07 20:51 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  21. 2026-10-06 19:38 UTCEG score recompute
  22. 2026-10-06 19:38 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  23. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-10-06 05:22 UTCEG score recompute
  25. 2026-10-06 05:22 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  26. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  27. 2026-10-05 04:27 UTCEG score recompute
  28. 2026-10-05 04:27 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  29. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  30. 2026-10-04 03:31 UTCEG score recompute
  31. 2026-10-04 03:31 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  32. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  33. 2026-10-03 02:36 UTCEG score recompute
  34. 2026-10-03 02:36 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  35. 2026-10-02 01:40 UTCEG score recompute
  36. 2026-10-02 01:40 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  37. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-10-01 00:42 UTCEG score recompute
  39. 2026-10-01 00:42 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  40. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  41. 2026-09-29 23:48 UTCEG score recompute
  42. 2026-09-29 23:48 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  43. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  44. 2026-09-28 21:13 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  45. 2026-09-28 19:30 UTCEG score recompute
  46. 2026-09-28 19:29 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  47. 2026-09-28 18:37 UTCEG score recompute
  48. 2026-09-28 18:37 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  49. 2026-09-28 16:27 UTCEG score recompute
  50. 2026-09-28 16:27 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  51. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  52. 2026-09-27 15:32 UTCEG score recompute
  53. 2026-09-27 15:31 UTCGHSA enrichmentGHSA-g43f-v3gj-45x5 · GitHub severity HIGH · GitHub CVSS 6.5
  54. 2026-09-26 14:34 UTCEG score recompute
  55. 2026-09-26 13:38 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  56. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-100651?
CVE-2026-100651 is a medium-severity vulnerability; its CVE record was published on September 26, 2026. vLLM before 0.29.0 fails to enforce decoder prompt-length validation on the disaggregated serving endpoint /inference/v1/generate. When the request contains a 'features' (multimodal) payload, vllm/entrypoints/serve/disagg/serving.py builds a multimodal EngineInput directly from the caller-supplied…
When was CVE-2026-100651 made public?
CVE-2026-100651 was made public on September 12, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 26, 2026. EchelonGraph's copy of the record carries a last-modified date of October 6, 2026; the record at its source may have been updated since.
Is CVE-2026-100651 actively exploited?
CVE-2026-100651 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100651?
CVE-2026-100651 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100651?
No fix for CVE-2026-100651 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists vllm-project vllm versions before 0.29.0 as affected, and vllm-project vllm versions 0.29.0 as unaffected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-100651 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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