Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
janhq jan — Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N N P L L L 5.3 .0019 8.7 —
AFFECTED
Product Versions Fixed
jan unspecified 3e1c1e724f696620d89bb4a9cc18a380e0753757
TIMELINE
Jul 23 Reserved by VulnCheck
Jul 24 Published (CNA: VulnCheck)
Jul 25 EXPLOIT PUBLISHED — CVE-2026-66005 (janhq jan). Public exploit reference added.
Description
Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 23, 2026 | Reserved | Reserved by VulnCheck |
| July 24, 2026 | Published | Published (CNA: VulnCheck) |
| July 25, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-66005 (janhq jan). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| janhq | jan | — | — | 3e1c1e724f696620d89bb4a9cc18a380e0753757 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66005 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.