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CVE-2026-78662— Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

Quick assessment

Affected
golang.org/x/crypto golang.org/x/crypto/ssh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Golang是美国Google公司开源的一种支持高并发与系统级开发的静态编程语言。 Google Golang 0.56.0之前版本存在资源管理错误漏洞，该漏洞源于通道在建立前对incomingRequests处理不当，恶意对等方可发送大量请求淹没通道，导致整个连接死锁。

AI Predicted 5.0 Difficulty: Moderate EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information

Affected Version Matrix 1

VendorProduct Version RangeStatus
golang.org/x/crypto golang.org/x/crypto/ssh < 0.56.0 affected
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I. Basic Information for CVE-2026-78662

Vulnerability Information
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Vulnerability Title
Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh
Source: CVE Program / CVE List V5
Vulnerability Description
Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Golang 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Golang是美国Google公司开源的一种支持高并发与系统级开发的静态编程语言。 Google Golang 0.56.0之前版本存在资源管理错误漏洞，该漏洞源于通道在建立前对incomingRequests处理不当，恶意对等方可发送大量请求淹没通道，导致整个连接死锁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
golang.org/x/crypto golang.org/x/crypto/ssh 0 ~ 0.56.0 -

II. Public POCs for CVE-2026-78662

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III. Intelligence Information for CVE-2026-78662

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Patches & Fixes for CVE-2026-78662 (1)

Vendor Advisories for CVE-2026-78662 (1)

Proof of Concept for CVE-2026-78662 (1)

Mailing List Discussions for CVE-2026-78662 (1)

IV. Related Vulnerabilities

Same product: golang.org/x/crypto/ssh
Same vendor: golang.org/x/crypto

V. Comments for CVE-2026-78662

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