Calibre Web and Autocaliweb have a ReDoS vulnerability
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | calibreweb | <= 0.6.24 | no fix |
References
- CVSS vector
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- Weakness (CWE)
CWE-1333- Platform
- Python (PyPI)
- Package
calibreweb- Disclosed
- 24.07.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1228 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-2g7m-ph9x-7q7m - CC BY 4.0
Vulnerability history: calibreweb
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 18
- First → latest
- 01.2022 12.2025
- Without a fix
- 4
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
- High 4
- Medium 9
- Low 1
Disclosures per year
- 2022: 9
- 2023: 2
- 2024: 4
- 2025: 3
- 2026: 0
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Calibre Web and Autocaliweb have a ReDoS vulnerability this entry
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