CVE-2026-120236

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreHIGH confidence

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

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-11-01. A secondary CVSS source baseline 6.3; sources differ by 0.0.

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

Also known asEUVD-2026-114875 (ENISA EUVD) · GHSA-42cj-2xxr-4gv8 (GitHub Security Advisories)Source: ENISA EUVD

6.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.3%CVSS: 6.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A vulnerability was detected in ag-ui-protocol ag-ui up to 0.0.58. Affected by this vulnerability is an unknown functionality of the component Transport Decoder Handler. The manipulation results in improper input validation. The attack may be launched remotely. The exploit is now public and may be used. The patch is identified as 660182b973a44b8eda5484b14b88eb9cc251edc4. It is suggested to upgrade the affected component.

CVSS v3
6.3
EG Score
6.3MEDIUMhigh confidence
EG Risk
44
EG Risk 44/100

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)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
18th
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 (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). 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.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).

A fix is available. Apply it within your standard update timelines.

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.

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

November 1, 2026

Last Modified

November 2, 2026

Advisory Details (3)

Auto-updated Nov 1, 2026
Patch available. Sources: github_pr.
Web page

GitHub - ag-ui-protocol/ag-ui: AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications. · GitHub

https://github.com/ag-ui-protocol/ag-ui/
GitHub pull request Patch Available

AG-UI 1.0

Patch available: ag-ui-protocol/ag-ui release/2026-09-23 (PR #2774 merged 2026-09-17)

https://github.com/ag-ui-protocol/ag-ui/pull/2774
Web page

[BUG]: Protobuf-decoded events skip `EventSchemas.parse` entirely (validation asymmetry vs SSE) · Issue #2524 · ag-ui-protocol/ag-ui · GitHub

https://github.com/ag-ui-protocol/ag-ui/issues/2524

Vendor Advisories for CVE-2026-120236(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 8× in last 7d / 22× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  3. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  4. 2026-11-11 07:01 UTCEchelonGraph re-scored
  5. 2026-11-11 07:01 UTCGHSA enrichmentGHSA-42cj-2xxr-4gv8 · GitHub severity LOW · GitHub CVSS 6.3
  6. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-11-04 01:50 UTCEchelonGraph re-scored
  14. 2026-11-04 01:50 UTCGHSA enrichmentGHSA-42cj-2xxr-4gv8 · GitHub severity LOW · GitHub CVSS 6.3
  15. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-11-02 16:29 UTCEchelonGraph re-scored
  18. 2026-11-02 16:29 UTCGHSA enrichmentGHSA-42cj-2xxr-4gv8 · GitHub severity LOW · GitHub CVSS 6.3
  19. 2026-11-02 15:26 UTCNVD updateCVSS v4 → 2.1
  20. 2026-11-02 15:26 UTCEchelonGraph re-scored
  21. 2026-11-02 15:26 UTCGHSA enrichmentGHSA-42cj-2xxr-4gv8 · GitHub severity LOW · GitHub CVSS 6.3
  22. 2026-11-02 14:43 UTCEchelonGraph re-scored
  23. 2026-11-02 14:43 UTCGHSA enrichmentGHSA-42cj-2xxr-4gv8 · GitHub severity LOW · GitHub CVSS 6.3
  24. 2026-11-02 14:41 UTCMITRE cvelistV5CVSS v4 → 5.3
  25. 2026-11-01 18:02 UTCENISA EUVD ID recordedEUVD-2026-114875 · Source: ENISA EUVD
Show 4 more
  1. 2026-11-01 17:27 UTCEchelonGraph re-scored
  2. 2026-11-01 17:26 UTCNVD updateCVSS v4 → 2.1
  3. 2026-11-01 16:52 UTCEchelonGraph re-scoredFirst assessed: 6.3 MEDIUM
  4. 2026-11-01 16:51 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-120236?
CVE-2026-120236 is a medium-severity vulnerability; its CVE record was published on November 1, 2026. A vulnerability was detected in ag-ui-protocol ag-ui up to 0.0.58. Affected by this vulnerability is an unknown functionality of the component Transport Decoder Handler. The manipulation results in improper input validation. The attack may be launched remotely. The exploit is now public and may be…
When was the CVE record for CVE-2026-120236 published?
The CVE record for CVE-2026-120236 was published on November 1, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 2, 2026; the record at its source may have been updated since.
Is CVE-2026-120236 actively exploited?
CVE-2026-120236 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-120236?
CVE-2026-120236 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-120236?
A fix for CVE-2026-120236 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-120236 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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