Denial of Service Vulnerability in Calibre Web and Autocaliweb Products
CVE-2025-6998

8.7HIGH

Key Information:

Vendor: Calibre Web
Status: Calibre Web; Autocaliweb
Vendor: CVE Published:; 24 July 2025

🔔 Create Calibre Web Vulnerability Alert

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6998?

A vulnerability exists in the strip_whitespaces() function found in cps/string_helper.py of both Calibre Web and Autocaliweb. This issue allows unauthenticated attackers to exploit the login functionality by sending specially crafted username parameters. These parameters cause catastrophic backtracking in the regular expression processing, potentially leading to a denial of service, thereby affecting the availability of the affected systems.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

Autocaliweb Linux 0.7.0 < 0.7.1

Calibre Web Linux 0.6.24

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-6998-CalibreWeb-0.6.24-ReDoS
Created by mind2hex