CVE-2026-56678: 9router: Kiro region injection allows authenticated SSRF with Authorization header forwarding

September 23, 2026

The Kiro API-key validation endpoint builds an upstream URL using a user-controlled region value. By supplying a crafted region such as kiro-canary.local:8443#, an authenticated attacker can cause 9router to send the Kiro validation request to an attacker-controlled host under the constructed codewhisperer.<region> hostname. The request forwards the submitted Kiro API key as an Authorization: Bearer header.

References

github.com/advisories/GHSA-6mwv-4mrm-5p3m
github.com/decolua/9router/commit/126aa244c5b51b74ab8c7594e3418fcf4437bf6f
github.com/decolua/9router/releases/tag/v0.5.6
github.com/decolua/9router/security/advisories/GHSA-6mwv-4mrm-5p3m
nvd.nist.gov/vuln/detail/CVE-2026-56678

Code Behaviors & Features

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