CVE-2026-35583: Emissary has a Path Traversal via `Blacklist` Bypass in Configuration API

April 8, 2026

The configuration API endpoint (/api/configuration/{name}) validated configuration names using a blacklist approach that checked for \, /, .., and trailing .. This could potentially be bypassed using URL-encoded variants, double-encoding, or Unicode normalization to achieve path traversal and read configuration files outside the intended directory.

References

github.com/NationalSecurityAgency/emissary
github.com/NationalSecurityAgency/emissary/pull/1292
github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-hxf2-gm22-7vcm
github.com/advisories/GHSA-hxf2-gm22-7vcm
nvd.nist.gov/vuln/detail/CVE-2026-35583

Code Behaviors & Features

Detect and mitigate CVE-2026-35583 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →