Description
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.
CVSS 7.4EPSS 0.254%Risk 0.76
View source- Published
- 2026-08-21 23:16:26
- Affected versions
- >=0.3.1,<4.9.1
- Type
- Other
- Last modified
- 2026-08-25 17:17:29
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H