CVE-2026-118653
Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
Echo is a Go web framework. From 4.0.0 until 5.1.0, Context.RealIP falls back to client-supplied X-Forwarded-For or X-Real-IP values when Echo.IPExtractor is unset, and the default RateLimiter uses that result as its client identifier. A remote attacker can rotate arbitrary forwarded-address values to obtain new rate-limit buckets and bypass IP-based throttling used for controls such as brute-force or request-volume protection. This issue is fixed in Echo v5.1.0.
Fixes and workarounds
Fix
github.com/labstack/echo/v5 (Go): OSV reports a fixed version 5.1.0. Check the advisory for supported release branches.
Source: OSV GHSA-246p-cpwv-v3jqAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| echo labstack |
>= 4.0.0, < 5.1.0 (affected) | CNA: GitHub_M |
github.com/labstack/echo/v5github.com/labstack/echo/v5
Go |
≥ 0; < 5.1.0 (affected, semver); OSV events: introduced 0; fixed 5.1.0Source events (semver)Other versions: unaffected |
OSV GHSA-246p-cpwv-v3jq |
github.com/labstack/echo/v4github.com/labstack/echo/v4
Go |
≥ 4.0.0; ≤ 4.16.2 (affected, semver); OSV events: introduced 4.0.0; last affected 4.16.2Source events (semver)Other versions: unaffected |
OSV GHSA-246p-cpwv-v3jq |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/labstack/echo/security/advisories/GHSA-246p-cpwv-v3jq
exploit · ADP: CISA-ADP
References
- https://github.com/labstack/echo/security/advisories/GHSA-246p-cpwv-v3jqCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/labstack/echo/commit/22e4b71109ef072ef011a489066ec662ca9565b2CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v5.1.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/security/advisories/GHSA-246p-cpwv-v3jqADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-246p-cpwv-v3jqOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-246p-cpwv-v3jqOSV / GitHub Security Advisories · osv
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