What’s Vulnerable › Vulnerabilities

CVE-2026-118265: Echo: X-Real-IP extractor trusts the header value instead of the sending peer

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-29
• Weakness: CWE-348

Description

Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's ExtractIPFromRealIPHeader validates whether the client-supplied X-Real-IP value belongs to a trusted range instead of validating the direct network peer. A client reaching Echo directly, or through a proxy that preserves the header, can supply a loopback or private address and have Context.RealIP return that spoofed identity. Applications using the extractor for IP allowlists, rate limiting, audit logs, or forwarding headers can consequently trust an attacker-controlled address; the default direct extractor and Echo v4 are unaffected. This issue is fixed in 5.4.1.

Affected products

• labstack echo: from 5.0.0, < 5.4.1

References

• https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae
• https://github.com/labstack/echo/releases/tag/v5.4.1
• https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg

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