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CVE-2025-6998

HighPublished

Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS

Published: Jul 24, 2025
Updated: Jul 25, 2025
Assigning CNA: Fluid Attacks
Evidence observed: Aug 8, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 55.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-6998-CalibreWeb-0.6.24-ReDoSExploit
Exploit for the redos for CalibreWeb v0.6.24

Responsible use

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