CVE-2026-118651: medium-severity vulnerability in labstack echo
Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.2%
Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
labstack · echoRelated CVEs — labstack echo
In the same product, most dangerous first.
CVE-2026-55677HIGHEcho: Encoded slash (%2F) bypasses route-level protection and exposes static filesEPSS 0.5%CVE-2026-118264CRITICALEcho: Rejected WebSocket upgrades can bypass Echo route-level access controlsEPSS 0.4%CVE-2026-118653MEDIUMEcho: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default ConfigurationEPSS 0.4%CVE-2026-118650HIGHEcho: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served pathEPSS 0.4%CVE-2026-118263MEDIUMEcho: BodyDump can discard BodyLimit overflow errors for unknown-length requestsEPSS 0.4%CVE-2026-25766MEDIUMEcho has a Windows path traversal via backslash in middleware.Static default filesystemEPSS 0.4%