CVE-2025-6998 json
Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS
published 2025-07-24 15 mo ago modified 2026-07-07 4 mo ago also GHSA-2g7m-ph9x-7q7m , PYSEC-2026-1228 , EUVD-2025-22540
- cvss
- 8.7
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Autocaliweb Autocaliweb 0.7.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 15 mo ago
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 4.0 | 8.7 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | calibreweb | <=0.6.24 |
no fix listed |
Affected products
- Calibre Web Calibre Web
- Autocaliweb Autocaliweb
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
fluidattacks.com
/advisories/megadeth
third-party-advisory, web
-
github.com
/janeczku/calibre-web
product, package
-
github.com
/gelbphoenix/autocaliweb
product, web
-
nvd.nist.gov
/vuln/detail/CVE-2025-6998
advisory
-
pypi.org
/project/calibreweb
package
-
github.com
/advisories/GHSA-2g7m-ph9x-7q7m
advisory
Sources
- CVE List CVE-2025-6998
- GitHub Advisory GHSA-2g7m-ph9x-7q7m
- NVD CVE-2025-6998
- OSV PYSEC-2026-1228
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.