CVE-2026-55641

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). 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
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this exposes the /v1 proxy to upstream provider calls using stored provider credentials and allows /v1/search with the searxng provider_options.baseUrl parameter to drive server-side requests to internal or cloud-metadata hosts. This issue is fixed in version 0.5.2.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100CISA 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
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; 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
0.3%
EPSS %ILE
23rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; 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 public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

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.
githubMentions a patch (unverified)🟡 PoC Available

Unauthenticated `/v1` proxy access in [email protected] via `Host`-header spoofing → open AI relay + SSRF · Advisory · decolua/9router · GitHub

https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c
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

Vendor Advisories for CVE-2026-55641(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
9router—
  • every version up to 0.5.2: fixed in 0.5.2
—

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 7× 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.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
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  1. 2026-09-16 05:15 UTCEPSS rescore
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  7. 2026-09-11 14:53 UTCEPSS rescore
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  26. 2026-08-26 14:46 UTCEPSS rescore
  27. 2026-08-26 03:39 UTCEG score recompute
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  37. 2026-08-19 17:04 UTCEPSS rescore
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  39. 2026-08-18 13:48 UTCEPSS rescore
  40. 2026-08-17 15:57 UTCEG score recompute
  41. 2026-08-17 13:47 UTCEPSS rescore
  42. 2026-08-16 17:57 UTCEG score recompute
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-16 06:50 UTCEG score recompute
  45. 2026-08-16 02:14 UTCEPSS rescore
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  66. 2026-08-04 10:39 UTCEPSS rescore
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  74. 2026-07-30 16:28 UTCEPSS rescore
  75. 2026-07-30 16:09 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-55641?
CVE-2026-55641 is a high vulnerability published on July 10, 2026. 9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this…
When was CVE-2026-55641 disclosed?
CVE-2026-55641 was first published 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-2026-55641 actively exploited?
CVE-2026-55641 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55641?
CVE-2026-55641 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55641?
A fix for CVE-2026-55641 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55641 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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