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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Calibre Web | Calibre Web | 0.6.24 | — |
| Autocaliweb | Autocaliweb | 0.7.0 – < 0.7.1 | 0.7.1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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mind2hex/CVE-2025-6998-CalibreWeb-0.6.24-ReDoS ★ 0 · Jul 27, 2025
Exploit for the redos for CalibreWeb v0.6.24
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | calibreweb | <= 0.6.24 | — | GHSA-2g7m-ph9x-7q7m |
References
- https://fluidattacks.com/advisories/megadeth third-party-advisory
- https://github.com/janeczku/calibre-web product
- https://github.com/gelbphoenix/autocaliweb product