CVE-2025-6998

Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS

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.

Category

8.7
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.09%
Third-Party Advisory fluidattacks.com
Affected: Calibre Web Calibre Web
Affected: Autocaliweb Autocaliweb
Published at:
Updated at:

References

Link Tags
https://fluidattacks.com/advisories/megadeth third party advisory
https://github.com/janeczku/calibre-web product
https://github.com/gelbphoenix/autocaliweb product

Frequently Asked Questions

What is the severity of CVE-2025-6998?
CVE-2025-6998 has been scored as a high severity vulnerability.
How to fix CVE-2025-6998?
To fix CVE-2025-6998, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-6998 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-6998 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6998?
CVE-2025-6998 affects Calibre Web Calibre Web, Autocaliweb Autocaliweb.
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