What is CVE-2025-6998?

CVE-2025-6998 is a vulnerability in Autocaliweb, classified under Inefficient Regular Expression Complexity. Published 2025-07-24.

Is CVE-2025-6998 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Autocaliweb

CVE-2025-6998

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.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.008 (53.8th percentile) — read the EPSS interpretation.

Affected products

Autocaliweb — versions 0.7.0
Calibre Web — versions 0.6.24

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

Public proof-of-concept exploits

References

help@fluidattacks.com (third-party-advisory)
help@fluidattacks.com (product)
help@fluidattacks.com (product)

Frequently asked questions

What is CVE-2025-6998?: CVE-2025-6998 is a vulnerability in Autocaliweb, classified under Inefficient Regular Expression Complexity. Published 2025-07-24.
Is CVE-2025-6998 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.