proxy-addr is bundled by Express and used in many Node.js apps; this bug allows universal IP-trust bypass, affecting widespread web applications and auth/rate controls.
CVE-2026-90711
IP-trust bypass in proxy-addr lets attackers spoof client IP via X-Forwarded-For.
Is CVE-2026-90711 being exploited?
Not confirmed. CVE-2026-90711 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-90711?
CVE-2026-90711 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-90711?
Yes. A fix has been recorded for CVE-2026-90711. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-90711 affect?
CVE-2026-90711 affects proxy-addr 1.1.0-2.0.7, Express (via proxy-addr), Node.js applications using proxy-addr/Express. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-90711?
Upgrade proxy-addr to >=2.0.8 and audit trusted-proxy subnet notation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can control req.ip via X-Forwarded-For, bypassing IP-based auth, rate limits, geofencing, and tampering audit logs.
Immediate action required
- affected>= 1.1.0 and < 2.0.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.