# CVE-2025-6998

## Summary

- **CVE ID:** CVE-2025-6998
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-1333
- **Published:** Jul 24, 2025
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- Calibre Web — Calibre Web (0.6.24)
- Autocaliweb — Autocaliweb (0.7.0)

## References

- [CNA](https://fluidattacks.com/advisories/megadeth)
- [CNA](https://github.com/janeczku/calibre-web)
- [CNA](https://github.com/gelbphoenix/autocaliweb)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.83%
- **EPSS Percentile:** 55.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._