CVE-2026-84857

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-02. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A flaw has been found in sigoden aichat up to 0.30.4. This affects an unknown function of the file src/serve.rs of the component API Endpoint. This manipulation causes uncontrolled memory allocation. The attack can be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

CVE/AIChat_Serve_Request_Body_DoS_Report at main · outlookgp/CVE · GitHub

https://github.com/outlookgp/CVE/tree/main/AIChat_Serve_Request_Body_DoS_Report

Vendor Advisories for CVE-2026-84857(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 19× in last 7d / 50× 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. 2026-09-18 22:10 UTCEG score recompute
  2. 2026-09-18 22:10 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 22:21 UTCEG score recompute
  5. 2026-09-17 22:21 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-16 22:32 UTCEG score recompute
  8. 2026-09-16 22:32 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 22:32 UTCEG score recompute
  12. 2026-09-15 22:32 UTCGHSA enrichment
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 22:43 UTCGHSA enrichment
  16. 2026-09-13 22:54 UTCEG score recompute
  17. 2026-09-13 22:54 UTCGHSA enrichment
  18. 2026-09-12 23:05 UTCEG score recompute
  19. 2026-09-12 23:05 UTCGHSA enrichment
  20. 2026-09-11 23:16 UTCEG score recompute
  21. 2026-09-11 23:16 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-10 23:19 UTCEG score recompute
  25. 2026-09-10 23:19 UTCGHSA enrichment
Show 25 more
  1. 2026-09-09 23:30 UTCGHSA enrichment
  2. 2026-09-08 23:10 UTCEG score recompute
  3. 2026-09-08 23:10 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 16:58 UTCEG score recompute
  6. 2026-09-07 16:58 UTCGHSA enrichment
  7. 2026-09-06 17:09 UTCEG score recompute
  8. 2026-09-06 17:09 UTCGHSA enrichment
  9. 2026-09-06 13:48 UTCEPSS rescore
  10. 2026-09-05 17:18 UTCEG score recompute
  11. 2026-09-05 17:17 UTCGHSA enrichment
  12. 2026-09-05 15:31 UTCEPSS rescore
  13. 2026-09-04 17:28 UTCEG score recompute
  14. 2026-09-04 17:28 UTCGHSA enrichment
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-03 17:39 UTCGHSA enrichment
  17. 2026-09-03 16:33 UTCEG score recompute
  18. 2026-09-03 16:33 UTCGHSA enrichment
  19. 2026-09-03 16:32 UTCNVD updateCVSS v4 → 5.5
  20. 2026-09-03 15:46 UTCEG score recompute
  21. 2026-09-03 15:46 UTCGHSA enrichment
  22. 2026-09-03 15:43 UTCMITRE cvelistV5CVSS v4 → 6.9
  23. 2026-09-02 20:19 UTCNVD updateCVSS v4 → 5.5
  24. 2026-09-02 20:17 UTCEG score recompute
  25. 2026-09-02 20:15 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84857?
CVE-2026-84857 is a medium vulnerability published on September 2, 2026. A flaw has been found in sigoden aichat up to 0.30.4. This affects an unknown function of the file src/serve.rs of the component API Endpoint. This manipulation causes uncontrolled memory allocation. The attack can be initiated remotely. The exploit has been published and may be used. The vendor…
When was CVE-2026-84857 disclosed?
CVE-2026-84857 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84857 actively exploited?
CVE-2026-84857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.9% of all scored CVEs.
What is the CVSS score of CVE-2026-84857?
CVE-2026-84857 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-84857?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84857, 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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