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CVE-2026-78662

7.5 · HIGH

Previously, a channel registered in the mux's chanList is not usable until it is established.

Published Sep 2, 2026golangCWE-770EPSS 0.43%

Overview

CVE-2026-78662 is a high-severity vulnerability affecting golang crypto. It was published on September 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from golang. Update crypto to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
golangcrypto>= 0, < 0.56.0Affected

References

Refgo.dev/cl/826504Refgo.dev/issue/81316Refgroups.google.com/g/golang-announce/c/1y3fb2np35URefpkg.go.dev/vuln/GO-2026-6354

How CyberStrike helps

Frequently asked questions

What is CVE-2026-78662?

CVE-2026-78662 is a high-severity vulnerability affecting golang crypto. It was published on September 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-78662?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-78662?

Check the references section for vendor advisories and patches from golang. Update crypto to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-78662?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-78662 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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