MEDIUM

CVE-2026-48125

CVSS v3

5.3

MEDIUM

EPSS Score

0.5 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

ua-parser-jsnpmfrom 2.0.1 · fixed in 2.0.10

Vendor advisories

CVE-2026-48125 Red Hat Product Security18 known affected
ua-parser-js: UAParser.js: Denial of Service via crafted Client Hints header
gatekeeper/gatekeeper-rhel9 as a component of Gatekeeper 3 · rhmtc/openshift-migration-ui-rhel8 as a component of Migration Toolkit for Containers · rh-podman-desktop.git as a component of Red Hat Build of Podman Desktop

Full record on NVD

Description

UAParser.js is a JavaScript library to detect browsers, operating systems, CPUs, and devices from user-agent data. From 2.0.1 until 2.0.10, a regular expression denial-of-service vulnerability exists when using the Client Hints API. By sending a crafted Sec-CH-UA-Model header to an application that calls UAParser(headers).withClientHints(), an attacker can cause excessive CPU time due to catastrophic backtracking in the device regex because Client Hints values are copied without the UA_MAX_LENGTH limit used for User-Agent values. This issue is fixed in version 2.0.10.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: 2026-07-14
Last Modified: 2026-07-15

Frequently asked questions

What is CVE-2026-48125?

Is CVE-2026-48125 actively exploited?

Active exploitation of CVE-2026-48125 has not been confirmed. Its EPSS score was 0.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-48125?

CVE-2026-48125 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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