Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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（Wee Enhanced Environment for Chat）是一款开源的聊天客户端。在 0.3.1 至 4.9.0 版本中，WeeChat 中继（relay）的认证机制使用了非恒定时间字符串比较函数（weechat_strcasecmp 和 strcmp）来验证密码哈希值和明文密码。攻击者可以利用这些比较操作引入的时间差异，逐字符地提取服务器计算的密码哈希值，随后在使用正确哈希值的情况下完成认证，而无需知晓原始密码。该问题已在 4.9.1 版本中得到修复。

CVSS 7.4 · High EPSS 0.25% · P17

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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53525

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

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
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-53525

请登录查看更多情报信息。

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

No comments yet

Leave a comment