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CVE-2026-53525— WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication

Quick assessment

Affected
weechat weechat
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WeeChat是WeeChat团队开源的一款可扩展的即时聊天客户端应用程序。 WeeChat 0.3.1版本至4.9.0版本存在侧信道信息泄露漏洞，该漏洞源于中继身份验证使用非常量时间字符串比较函数（weechat_strcasecmp和strcmp）验证密码哈希和明文密码，可能导致攻击者利用时间差异逐字符提取服务器计算的哈希，从而在不知道密码的情况下使用正确哈希进行身份验证。

CVSS 7.4 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
weechat weechat >= 0.3.4, < 4.9.1 affected
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I. Basic Information for CVE-2026-53525

Vulnerability Information
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Vulnerability Title
WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
WeeChat 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WeeChat是WeeChat团队开源的一款可扩展的即时聊天客户端应用程序。 WeeChat 0.3.1版本至4.9.0版本存在侧信道信息泄露漏洞，该漏洞源于中继身份验证使用非常量时间字符串比较函数（weechat_strcasecmp和strcmp）验证密码哈希和明文密码，可能导致攻击者利用时间差异逐字符提取服务器计算的哈希，从而在不知道密码的情况下使用正确哈希进行身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
weechat weechat >= 0.3.4, < 4.9.1 -

II. Public POCs for CVE-2026-53525

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11046 chars
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III. Intelligence Information for CVE-2026-53525

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Vendor Advisories for CVE-2026-53525 (1)

IV. Related Vulnerabilities

Same product: weechat
Same vendor: weechat
Same weakness: CWE-208

V. Comments for CVE-2026-53525

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