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CVE-2025-6998— Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS

Quick assessment

Affected
Calibre Web Calibre Web
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.

Calibre-Web是Jan B个人开发者的一款用于浏览、阅读和下载Calibre数据库中电子书的Web应用程序。 Calibre-Web 0.6.24版本 存在安全漏洞，该漏洞源于strip_whitespaces函数存在正则表达式拒绝服务漏洞，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.83% · P55

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-6998

Vulnerability Information
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Vulnerability Title
Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS
Source: CVE Program / CVE List V5
Vulnerability Description
ReDoS in strip_whitespaces() function in cps/string_helper.py in Calibre Web and Autocaliweb allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. This issue affects Calibre Web: 0.6.24 (Nicolette); Autocaliweb: from 0.7.0 before 0.7.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Calibre-Web 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Calibre-Web是Jan B个人开发者的一款用于浏览、阅读和下载Calibre数据库中电子书的Web应用程序。 Calibre-Web 0.6.24版本 存在安全漏洞，该漏洞源于strip_whitespaces函数存在正则表达式拒绝服务漏洞，可能导致拒绝服务攻击。
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
Calibre Web Calibre Web 0.6.24 -
Autocaliweb Autocaliweb 0.7.0 ~ 0.7.1 -

II. Public POCs for CVE-2025-6998

# POC Description Source Link Shenlong Link
1 Exploit for the redos for CalibreWeb v0.6.24 https://github.com/mind2hex/CVE-2025-6998-CalibreWeb-0.6.24-ReDoS POC Details
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No public POC found.

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III. Intelligence Information for CVE-2025-6998

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IV. Related Vulnerabilities

Same product: Calibre Web
Same vendor: Calibre Web
Same weakness: CWE-1333

V. Comments for CVE-2025-6998

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