CVE-2025-6998: Autocaliweb

High severity, CVSS 8.7. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Autocaliweb Autocaliweb: from 0.7.0, before 0.7.1 (fixed in 0.7.1)
• Calibre Web Calibre Web: version 0.6.24 only

Published 2025-07-24. Last modified 2026-06-17.