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CVE-2026-48125

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_LENGT
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ec4adc7849427a5643ea3e6bdb08ba9b6f9532473fa998e62720caabf22acbfc
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"ua-parser-js","vendor":"faisalman","versions":[{"status":"affected","version":">= 2.0.1, < 2.0.10"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/faisalman/ua-parser-js/commit/90354d3458495628b1d3ba68a9d76673e6d14fc5","tags":["x_refsource_MISC"],"url":"https://github.com/faisalman/ua-parser-js/commit/90354d3458495628b1d3ba68a9d76673e6d14fc5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/references/1
{"name":"https://github.com/faisalman/ua-parser-js/releases/tag/2.0.10","tags":["x_refsource_MISC"],"url":"https://github.com/faisalman/ua-parser-js/releases/tag/2.0.10"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/adp/0/references/0
{"name":"https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599","tags":["x_refsource_CONFIRM"],"url":"https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78ea7af6b30250649a6edfa715157dc5706aca9f36843a5c95760d8383c3a619 · sha256:d06d1e7312d94470… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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