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CVE-2026-118262 Details

Description

Echo is a Go web framework. From 4.15.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware can retain a handler, copy goroutines, and network connections after a WebSocket client disconnects when the upstream keeps its connection open. The raw proxy waits for both copy directions without reliably closing the peer connection when one direction ends, including when a rejected upgrade response uses HTTP keep-alive. Repeated connections can accumulate resources and cause denial of service, depending on proxy-route accessibility, upstream behavior, and connection deadlines. This issue is fixed in 4.16.1 and 5.4.1.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaaec	[email protected]
https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f	[email protected]
https://github.com/labstack/echo/releases/tag/v4.16.1	[email protected]
https://github.com/labstack/echo/releases/tag/v5.4.1	[email protected]
https://github.com/labstack/echo/security/advisories/GHSA-9969-6676-49h5	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-772	Missing Release of Resource after Effective Lifetime	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Translated	[email protected]
Nov 3, 2026	CVE Modified	CISA-ADP
Oct 28, 2026	New CVE Received	[email protected]