Weechat Weechat vulnerabilities
🔔 Create alert RSS Version checker
Published CVEs affecting Weechat Weechat: 2 record(s), with affected versions and fixes.
CVE-2026-53525
High · 7.4
CWE-208 Aug 21, 2026
WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication
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.
CVE-2026-53524
Medium · 6.5
CWE-409 Aug 21, 2026
WeeChat has a Decompression Bomb in Relay WebSocket (DoS)
WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.