Vulnerability DatabaseWS-2021-0012
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WS-2021-0012
Published:May 14, 2026
Updated:May 14, 2026
In uap-core before 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.
Affected Packages
uap-core (NPM):
Affected version(s) >=0.6.0 <0.11.0
Fix Suggestion:
Update to version 0.11.0
uaparser (RUST):
Affected version(s) >=0.6.2 <=0.6.4
Fix Suggestion:
Update to version no_fix
ua-parser (RUST):
Affected version(s) >=0.1.0 <=0.2.0
Fix Suggestion:
Update to version no_fix
Related Resources (1)
https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c
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CVSS v4
Base Score:
9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH