CVE-2017-18256
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource...
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
- Record
CVE-2017-18256- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
- Record
CVE-2017-18256- Updated
- 2026-11-02
EUVDEUVD-2017-9387 No score
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
- Record
EUVD-2017-9387- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-57mp-vw5r-fm9q
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource...
Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
- Record
GHSA-57mp-vw5r-fm9q- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Brave Browser < 0.13.0 - 'long alert() argument' Denial of Service | 2018-04-17 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-18256 is a medium vulnerability (CVSS 6.5) in Brave Browser, published April 4, 2018. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.84%, the 92nd percentile. No source names a fixed version.