CVE-2025-6998

Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS

CVSS 8.7 HIGHEPSS 0.8%CWE-1333

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.8%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

24 Jul 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected products

Autocaliweb · Autocaliweb Calibre Web · Calibre Web

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References

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