Bug 2530580

Summary: CVE-2026-56855 openbao: golang.org/x/crypto/ssh: Denial of Service via crafted messages [epel-all]
Product: [Fedora] Fedora EPEL Reporter: jkelly <jkelly>
Component: openbaoAssignee: Dave Dykstra <dwd>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: dwd, go-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["6149aca5-d0d4-472f-b5bb-730faf189259"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-10 20:51:56 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: 2528050    

Description jkelly 2026-09-09 09:11:12 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, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.
Comment 1 Dave Dykstra 2026-09-10 20:51:56 UTC 
OpenBao does not use ssh channels.