Bug 2521991

Summary: CVE-2026-53525 weechat: WeeChat: Authentication bypass due to non-constant-time password hash comparison [epel-8]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: weechatAssignee: Paul P Komkoff Jr <i>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: epel10CC: i, michel, priv.luk
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["9d2c3ef7-5c7c-4670-a46d-2e7365d8ad75"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2521245    

Description Vladimir Vasilev 2026-08-24 15:05:44 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.

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.
Comment 1 Łukasz Patron 2026-08-24 20:00:21 UTC 
Renamed epel-all to epel-8 since epel9+ ships 4.10.0.