Echo WebSocket 代理在客戶端斷線後仍保留連線與處理器 - CVE-2026-118262
CVE-2026-118262 - Echo: WebSocket proxy can retain connections and handlers after client disconnect
Echo 的 Proxy 中介軟體在 WebSocket 客戶端斷線後，若上游保持連線，會保留處理器、goroutine 與網路連線，導致資源耗盡與拒絕服務。
- - 受影響版本：Echo 4.15.0~4.16.1、5.4.1。
- - 已修補：升級至 4.16.1 或 5.4.1。
- - 緩解建議：確保中介處理上游關閉，或設定代理連線逾時。
Echo Proxy 在 WebSocket 斷線後未關閉連線，易造成資源耗盡與拒絕服務，升級至 4.16.1 或 5.4.1 可修復。
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.
Impact
Affected Products
The following products are affected by CVE-2026-118262
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
| ID | Vendor | Product | Action |
|---|---|---|---|
| 1 | Labstack | echo |
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | [email protected] |
Update Echo's Proxy middleware to a fixed version to prevent resource exhaustion.
- Update Echo to version 4.16.1 or 5.4.1.
- Ensure middleware handles upstream connection closure.
- Implement connection timeouts for proxies.
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weaknesses.
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The following table lists the changes that have been made to the
CVE-2026-118262 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
十月. 28, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-772 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/118xxx/CVE-2026-118262.json">CVE-2026-118262</a> Added Reference https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaaec Added Reference https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f Added Reference https://github.com/labstack/echo/releases/tag/v4.16.1 Added Reference https://github.com/labstack/echo/releases/tag/v5.4.1 Added Reference https://github.com/labstack/echo/security/advisories/GHSA-9969-6676-49h5
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