CVE-2026-92363

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

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

Score 4.3 from GitHub Security Advisory published 2026-09-16. A secondary CVSS source baseline 4.3; sources differ by 0.0.

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

Also known asEUVD-2026-80708 (ENISA EUVD) · GHSA-gh4c-79cj-jr5j (GitHub Security Advisories)Source: ENISA EUVD

4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw has been found in ag-ui-protocol ag-ui 1.0. Affected is an unknown function of the file src/stream/sse_parser.cpp of the component JSON Parser. Executing a manipulation can lead to resource consumption. The attack may be performed from remote. This patch is called ab6e0bc298996caac2b4b0b3ec0bd8d32a15a186. Applying a patch is advised to resolve this issue.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100

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)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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
0.5%
EPSS %ILE
45th
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 (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 every mission impact level.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 every mission impact level.

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

Exploitation none (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

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
Patch available. Sources: github_pr, github_commit.
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 commit Patch Available

commit ab6e0bc29899 (ag-ui-protocol/ag-ui)

Patch available: ag-ui-protocol/ag-ui release/2026-08-27 (contains commit ab6e0bc29899)

https://github.com/ag-ui-protocol/ag-ui/commit/ab6e0bc298996caac2b4b0b3ec0bd8d32a15a186
GitHub pull request Patch Available

fix(c++): count the per-event accumulator against the SSE buffer cap

Patch available: ag-ui-protocol/ag-ui release/2026-08-27 (PR #2501 merged 2026-08-25)

https://github.com/ag-ui-protocol/ag-ui/pull/2501
Web page

[BUG]: C++ community SDK: per-event accumulator bypasses the chunk cap; JSON parsing has no depth limit · Issue #2440 · ag-ui-protocol/ag-ui · GitHub

https://github.com/ag-ui-protocol/ag-ui/issues/2440

Vendor Advisories for CVE-2026-92363(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 52× 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.

Showing the most recent 99 of 100 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 1 oldest row on record is not shown and was not checked, so the counts can still include repeats.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  6. 2026-10-28 02:25 UTCOSV refresh
  7. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  8. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  9. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  10. 2026-10-25 13:50 UTCEG score recompute
  11. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-10-18 03:00 UTCEG score recompute
  19. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-10-16 18:20 UTCEG score recompute
  21. 2026-10-16 18:20 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  22. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  23. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
Show 74 more
  1. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-12 14:44 UTCEG score recompute
  3. 2026-10-11 21:02 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  4. 2026-10-11 19:13 UTCEG score recompute
  5. 2026-10-11 16:29 UTCEG score recompute
  6. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  7. 2026-10-11 13:43 UTCEG score recompute
  8. 2026-10-10 20:05 UTCEG score recompute
  9. 2026-10-10 20:05 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-09 19:09 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  13. 2026-10-08 18:14 UTCEG score recompute
  14. 2026-10-08 18:14 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  15. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-07 12:20 UTCEG score recompute
  18. 2026-10-07 12:20 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  19. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-06 11:25 UTCEG score recompute
  21. 2026-10-06 11:25 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  22. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-05 10:30 UTCEG score recompute
  24. 2026-10-05 10:30 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  26. 2026-10-04 09:35 UTCEG score recompute
  27. 2026-10-04 09:35 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  28. 2026-10-03 08:39 UTCEG score recompute
  29. 2026-10-03 08:39 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  30. 2026-10-02 06:39 UTCEG score recompute
  31. 2026-10-02 06:39 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  32. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  33. 2026-10-01 05:41 UTCEG score recompute
  34. 2026-10-01 05:41 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  35. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  36. 2026-09-30 04:46 UTCEG score recompute
  37. 2026-09-30 04:46 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  38. 2026-09-29 03:51 UTCEG score recompute
  39. 2026-09-29 03:51 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  40. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  41. 2026-09-28 02:56 UTCEG score recompute
  42. 2026-09-28 02:55 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  43. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  44. 2026-09-27 01:58 UTCEG score recompute
  45. 2026-09-27 01:58 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  46. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  47. 2026-09-26 01:03 UTCEG score recompute
  48. 2026-09-26 01:03 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  49. 2026-09-25 00:06 UTCEG score recompute
  50. 2026-09-25 00:06 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  51. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  52. 2026-09-23 23:10 UTCEG score recompute
  53. 2026-09-23 23:10 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  54. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  55. 2026-09-22 22:13 UTCEG score recompute
  56. 2026-09-22 22:13 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  57. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  58. 2026-09-21 21:17 UTCEG score recompute
  59. 2026-09-21 21:17 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  60. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  61. 2026-09-20 20:22 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  62. 2026-09-19 19:27 UTCEG score recompute
  63. 2026-09-19 19:27 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  64. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  65. 2026-09-18 18:32 UTCEG score recompute
  66. 2026-09-18 18:32 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  67. 2026-09-18 17:54 UTCEG score recompute
  68. 2026-09-18 17:54 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  69. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  70. 2026-09-17 19:12 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  71. 2026-09-16 18:04 UTCEG score recompute
  72. 2026-09-16 18:03 UTCGHSA enrichmentGHSA-gh4c-79cj-jr5j · GitHub CVSS 4.3
  73. 2026-09-16 14:24 UTCEG score recompute
  74. 2026-09-16 13:38 UTCEG score recomputeFirst assessed: 4.3 MEDIUM

Frequently asked(5)

What is CVE-2026-92363?
CVE-2026-92363 is a medium-severity vulnerability; its CVE record was published on September 16, 2026. A flaw has been found in ag-ui-protocol ag-ui 1.0. Affected is an unknown function of the file src/stream/sse_parser.cpp of the component JSON Parser. Executing a manipulation can lead to resource consumption. The attack may be performed from remote. This patch is called…
When was the CVE record for CVE-2026-92363 published?
The CVE record for CVE-2026-92363 was published on September 16, 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 September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-92363 actively exploited?
CVE-2026-92363 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-92363?
CVE-2026-92363 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-2026-92363?
A fix for CVE-2026-92363 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-92363 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-92363

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