CVE-2026-48125Public exploitNetwork attack vector

Service interruption via unbounded Client Hints parsing

Published Jul 14, 2026 · Updated Jul 14, 2026

ReDoS in UAParser.js 2.0.1 through 2.0.9 allows remote attackers to consume excessive CPU via a crafted Sec-CH-UA-Model header. withClientHints() passes the unbounded model value into a device-detection regular expression whose ambiguous repetitions trigger catastrophic backtracking. Exposure requires an application to supply attacker-controlled Client Hints to withClientHints(); the resulting CPU exhaustion can interrupt that application’s service.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in UAParser.js 2.0.1 through 2.0.9 allows remote attackers to consume excessive CPU via a crafted Sec-CH-UA-Model header. withClientHints() passes the unbounded model value into a device-detection regular expression whose ambiguous repetitions trigger catastrophic backtracking. Exposure requires an application to supply attacker-controlled Client Hints to withClientHints(); the resulting CPU exhaustion can interrupt that application’s service.

The record

CVE
CVE-2026-48125
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Faisal Salman
Product
UAParser.js
Classifications
CWE-400, CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.1, < 2.0.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Faisal Salman · UAParser.jsversion=>= 2.0.1, < 2.0.10

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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