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)
Published · last modified .
EPSS exploit prediction
EPSS: 0.008 (56.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000
Affected products
- Autocaliweb — versions 0.7.0
- Calibre Web — versions 0.6.24
Weakness classification (CWE)
Public proof-of-concept exploits
References
- fluidattacks.com/advisories/megadeth (third-party-advisory)
- github.com/janeczku/calibre-web (product)
- github.com/gelbphoenix/autocaliweb (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.