CVE-2026-16732
CVE-2026-16732: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
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Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium6.1
Medium [CVE-2026-16732] Request spoofing via numeric trustProxy configuration
CVE-2026-16732Source published Source updated
fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function forms of trustProxy correctly, because those forms compile to predicates that inspect the connecting address. The hop-count form, where trustProxy is set to a number, compiles to a predicate that structurally ignores the address, so the guard is always satisfied for any hop count of one or more. Applications configured with a numeric trustProxy value, such as trustProxy set to 1 for a single reverse proxy, remain vulnerable: an attacker who can reach the Fastify origin directly, bypassing the…
- Affected products in this advisory
- Red Hat OpenShift Dev Spaces
- Source-reported affected versions
- 5.8.3
- Source-reported fixed versions
- 5.12.1
- Mitigation guidance
- To mitigate this issue, configure the `trustProxy` setting in fastify to use an IP address, CIDR range, or a custom function that explicitly validates the connecting address. Additionally, ensure that the Fastify origin is only accessible through the trusted proxy chain and not directly exposed to untrusted networks. Consult the fastify documentation for specific configuration details. Reloading or restarting the affected service may be required for changes to take effect.
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