CVE-2026-101101

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-28. A secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability has been found in ag-ui-protocol ag-ui up to 2026-09-07. This issue affects the function JSON.parse of the file legacy/convert.ts of the component Middleware. The manipulation leads to uncaught exception. Remote exploitation of the attack is possible. Upgrading to version 2026-09-08 is capable of addressing this issue. The identifier of the patch is 30f8c794d5b73df5c610153043db502b2cc106cc. Upgrading the affected component is recommended.

CVSS v3
4.3
EG Score
4.3MEDIUMhigh confidence
EG Risk
24
EG Risk 24/100CISA SSVC

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
Severity43% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 28, 2026

Last Modified

September 28, 2026

Advisory Details (4)

Auto-updated Sep 28, 2026
Patch available. Sources: github_pr, github_commit.
generic

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_commit Patch Available

commit 30f8c794d5b7 (ag-ui-protocol/ag-ui)

Patch available: ag-ui-protocol/ag-ui release/2026-09-08 (contains commit 30f8c794d5b7)

https://github.com/ag-ui-protocol/ag-ui/commit/30f8c794d5b73df5c610153043db502b2cc106cc
github_pr Patch Available

fix(client,a2a-middleware): surface malformed JSON as a stream error

Patch available: ag-ui-protocol/ag-ui release/2026-09-08 (PR #2493 merged 2026-09-01)

https://github.com/ag-ui-protocol/ag-ui/pull/2493
generic

[BUG]: Uncaught `JSON.parse` in the legacy converter and the A2A middleware · Issue #2444 · ag-ui-protocol/ag-ui · GitHub

https://github.com/ag-ui-protocol/ag-ui/issues/2444

Vendor Advisories for CVE-2026-101101(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 20× in last 7d / 20× 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. 2026-10-03 23:40 UTCEG score recompute
  2. 2026-10-03 23:40 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-02 23:52 UTCEG score recompute
  5. 2026-10-02 23:52 UTCGHSA enrichment
  6. 2026-10-02 00:02 UTCEG score recompute
  7. 2026-10-02 00:02 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-10-01 00:14 UTCEG score recompute
  10. 2026-10-01 00:14 UTCGHSA enrichment
  11. 2026-09-30 15:02 UTCEPSS rescore
  12. 2026-09-29 23:46 UTCEG score recompute
  13. 2026-09-29 23:46 UTCGHSA enrichment
  14. 2026-09-29 15:20 UTCEPSS rescore
  15. 2026-09-28 21:13 UTCGHSA enrichment
  16. 2026-09-28 19:27 UTCEG score recompute
  17. 2026-09-28 19:26 UTCGHSA enrichment
  18. 2026-09-28 18:20 UTCEG score recompute
  19. 2026-09-28 17:54 UTCEG score recompute
  20. 2026-09-28 17:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-101101?
CVE-2026-101101 is a medium vulnerability published on September 28, 2026. A vulnerability has been found in ag-ui-protocol ag-ui up to 2026-09-07. This issue affects the function JSON.parse of the file legacy/convert.ts of the component Middleware. The manipulation leads to uncaught exception. Remote exploitation of the attack is possible. Upgrading to version 2026-09-08…
When was CVE-2026-101101 disclosed?
CVE-2026-101101 was first published on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101101 actively exploited?
CVE-2026-101101 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101101?
CVE-2026-101101 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101101?
A fix for CVE-2026-101101 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-101101 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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