Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Echo v5 (github.com/labstack/echo/v5) versions 5.0.0 through 5.4.0 are affected. The ExtractIPFromRealIPHeader extractor checks whether the X-Real-IP value is in a trusted range instead of checking the direct network peer, so a remote client that can reach Echo directly, or reach it through a proxy that passes the header on, can make c.RealIP() return a spoofed loopback or private address. Upgrade to v5.4.1. Until then, use ExtractIPDirect or make sure only trusted proxies can reach Echo and that they overwrite client-supplied forwarding headers.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0014, the 3rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 28 Oct 2026, 19:17 UTC Confirmed by NVD
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV