CVE-2026-78662
A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.32% probability · 24th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- golang/crypto
- Source
- security@golang.org
References
- https://go.dev/cl/826504Patch
- https://go.dev/issue/81316Issue Tracking, Vendor Advisory
- https://groups.google.com/g/golang-announce/c/1y3fb2np35UMailing List, Vendor Advisory
- https://pkg.go.dev/vuln/GO-2026-6354Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.