Bug 2530812

Summary: CVE-2026-78662 complyctl: golang.org/x/crypto/ssh: Denial of Service via channel request flooding [fedora-all]
Product: [Fedora] Fedora Reporter: jkelly <jkelly>
Component: complyctlAssignee: Marcus Burghardt <maburgha>
Status: CLOSED NEXTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: go-sig, hbraswel, maburgha
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e558e301-1905-4049-a2bf-4abd80cf6714"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-05 09:44:52 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2528026    

Description jkelly 2026-09-09 12:15:20 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Marcus Burghardt 2026-09-10 11:11:39 UTC 
Same assessment as BZ 2530645. complyctl vendors golang.org/x/crypto v0.55.0 indirectly, but the only usage of the ssh subpackage is for public key fingerprint generation (ssh.NewPublicKey, ssh.FingerprintSHA256). The vulnerable SSH channel/mux code paths (Dial, NewClientConn, NewControlClientConn, NewServerConn) are unreachable — complyctl never opens SSH connections. The flaw is not exploitable. A dependency bump to golang.org/x/crypto >= v0.56.0 will be included in a forthcoming update.
Comment 2 Marcus Burghardt 2026-09-25 10:15:18 UTC 
PR proposed in Upstream: https://github.com/complytime/complyctl/pull/884
Comment 3 Marcus Burghardt 2026-10-05 09:44:52 UTC 
Fixes merged and included in v1.1.0: https://github.com/complytime/complyctl/releases/tag/v1.1.0