CVE-2025-6998

HIGH EPSS 52.9%

Published Jul 24, 202511mo ago · Modified Jun 17, 20262w ago

8.7 CVSS 4.0

High

Published Jul 24, 2025 11mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

8.7

Exploitability

—

Impact

—

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

52.9% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-1333

References 3

fluidattacks.com https://fluidattacks.com/advisories/megadeth
github.com https://github.com/gelbphoenix/autocaliweb
github.com https://github.com/janeczku/calibre-web

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.