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VulnerabilityCVE-2026-86543Published 2026-09-07

CVE-2026-86543 — knowns-dev knowns

critical

As of 2026-09-07, CVE-2026-86543 is a CRITICAL-severity vulnerability in knowns-dev knowns, CVSS v3.1 9.8, EPSS 0.4% (37.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-86543 as of 2026-09-07; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
9.8/10Critical
EPSS
0.4%Higher than 37.2% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
6.4/10Threadlinqs triage score
Published
CVSS v3.1 9.8 (CRITICAL) · CVSS v4.0 9.3 · EPSS 0.4% (higher than 37.2% of all scored CVEs) · Priority 6.4/10 · Published 2026-09-07

Last updated:

What is CVE-2026-86543?

knowns versions before 0.30.0 serve the management API without authentication on all network interfaces by default, with no password required on fresh installations. Attackers can access the unauthenticated /api/tunnel/start endpoint to provision a public tunnel and republish the API at a publicly accessible address.

The record classifies CVE-2026-86543 under weakness class CWE-306. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 28 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (FIRST)
0.4% probability of exploitation in the next 30 days, higher than 37.2% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-07

Is CVE-2026-86543 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-86543

No vendor patch reference has been recorded for CVE-2026-86543 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-86543

No threat campaign in the Threadlinqs corpus currently references CVE-2026-86543, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Technical analysis

Third-party advisory