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EUVD-2026-22083

fkie_cve-2021-21317

uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 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. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.

GHSA-p4pj-mg4r-x6v4 — Denial of Service in uap-core

Affected: npm: uap-core

## Impact

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.

## Patches

Please update uap-core to >= v0.11.0

Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.

gsd-2021-21317

UBUNTU-CVE-2021-21317

Affected: Ubuntu:20.04:LTS: uap-core, Ubuntu:22.04:LTS: uap-core, Ubuntu:24.04:LTS: uap-core, Ubuntu:25.10: uap-core, Ubuntu:26.04:LTS: uap-core