CVE-2026-55638

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

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

9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/* to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/* to bypass the API-key gate and cause the server to make upstream provider calls using operator-stored LLM provider credentials. This issue is fixed in version 0.5.2.

CVSS v3
8.6
EG Score
8.6(medium)
EPSS
29.3%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Unauthenticated LLM proxy access via /codex rewrite authorization bypass · Advisory · decolua/9router · GitHub

https://github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r
github_release Patch Available

feat: Combo Fusion + Capacity auto-switch, Kiro API-key, Claude auto-ping & 429 throttle version 0.5.2

Patch available: decolua/9router v0.5.2

https://github.com/decolua/9router/releases/tag/v0.5.2
github_commit Patch Available

commit b282f0554972 (decolua/9router)

Patch available: decolua/9router v0.5.2 (contains commit b282f0554972)

https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 17× 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. 2026-07-15 03:31 UTCEG score recompute
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-14 15:38 UTCEG score recompute
  5. 2026-07-14 03:46 UTCEG score recompute
  6. 2026-07-13 22:31 UTCEPSS rescore
  7. 2026-07-13 15:54 UTCEG score recompute
  8. 2026-07-13 06:13 UTCEPSS rescore
  9. 2026-07-13 06:13 UTCEPSS rescore
  10. 2026-07-13 04:01 UTCEG score recompute
  11. 2026-07-12 16:07 UTCEG score recompute
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-12 04:15 UTCEG score recompute
  14. 2026-07-11 16:18 UTCEG score recompute
  15. 2026-07-11 04:26 UTCEG score recompute
  16. 2026-07-10 16:33 UTCEG score recompute
  17. 2026-07-10 16:32 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55638?
CVE-2026-55638 is a high vulnerability published on July 10, 2026. 9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/ to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/ to bypass the API-key…
When was CVE-2026-55638 disclosed?
CVE-2026-55638 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55638 actively exploited?
CVE-2026-55638 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55638?
CVE-2026-55638 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-55638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55638, 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

Explore the affected products and dependency analysis for CVE-2026-55638

Explore →

Is Your Infrastructure Affected by CVE-2026-55638?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs