CVE-2026-90668

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-13. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

The webserver in UnrealIRCd 6.0.5 through 6.2.6 before 6.2.7 does not limit the number of HTTP request headers, which allows remote attackers to cause a denial of service (memory consumption and unresponsive server) via an HTTP request with an unlimited number of headers, if a websocket or JSON-RPC listener is enabled (disabled by default).

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 13, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 13, 2026
No patch confirmed yet.
generic

UnrealIRCd - The most widely deployed IRC server - UnrealIRCd

https://www.unrealircd.org/

Vendor Advisories for CVE-2026-90668(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 29× in last 7d / 33× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 19:32 UTCGHSA enrichment
  3. 2026-09-20 06:27 UTCGHSA enrichment
  4. 2026-09-19 17:18 UTCEG score recompute
  5. 2026-09-19 17:18 UTCGHSA enrichment
  6. 2026-09-19 04:13 UTCEG score recompute
  7. 2026-09-19 04:13 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 15:07 UTCGHSA enrichment
  10. 2026-09-18 02:03 UTCEG score recompute
  11. 2026-09-18 02:03 UTCGHSA enrichment
  12. 2026-09-17 19:32 UTCEPSS rescore
  13. 2026-09-17 12:58 UTCGHSA enrichment
  14. 2026-09-16 23:48 UTCEG score recompute
  15. 2026-09-16 23:48 UTCGHSA enrichment
  16. 2026-09-16 14:09 UTCEPSS rescore
  17. 2026-09-16 10:43 UTCEG score recompute
  18. 2026-09-16 10:43 UTCGHSA enrichment
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 21:31 UTCGHSA enrichment
  21. 2026-09-15 08:26 UTCEG score recompute
  22. 2026-09-15 08:26 UTCGHSA enrichment
  23. 2026-09-15 03:12 UTCEPSS rescore
  24. 2026-09-14 19:21 UTCEG score recompute
  25. 2026-09-14 19:21 UTCGHSA enrichment
Show 8 more
  1. 2026-09-14 18:27 UTCEG score recompute
  2. 2026-09-14 18:27 UTCGHSA enrichment
  3. 2026-09-14 18:09 UTCGHSA enrichment
  4. 2026-09-14 04:26 UTCGHSA enrichment
  5. 2026-09-13 15:22 UTCEG score recompute
  6. 2026-09-13 15:22 UTCGHSA enrichment
  7. 2026-09-13 02:17 UTCEG score recompute
  8. 2026-09-13 02:16 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90668?
CVE-2026-90668 is a high vulnerability published on September 13, 2026. The webserver in UnrealIRCd 6.0.5 through 6.2.6 before 6.2.7 does not limit the number of HTTP request headers, which allows remote attackers to cause a denial of service (memory consumption and unresponsive server) via an HTTP request with an unlimited number of headers, if a websocket or JSON-RPC…
When was CVE-2026-90668 disclosed?
CVE-2026-90668 was first published in the National Vulnerability Database on September 13, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90668 actively exploited?
CVE-2026-90668 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 73.4% of all scored CVEs.
What is the CVSS score of CVE-2026-90668?
CVE-2026-90668 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-90668?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90668, 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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