CVE-2026-53525
WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-208 |
| Vendor | weechat |
| Product | weechat |
| Published | Aug 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
weechat / weechat
>= 0.3.4, < 4.9.1