CVE-2026-73088Public exploitNetwork attack vectorHinoki check available

Process crash via inherited custom-statistics keys

Published Aug 11, 2026 · Updated Aug 11, 2026

Prototype pollution in Browserslist before 4.28.7 allows attackers to crash invoking processes through crafted custom statistics. normalizeStats() iterates untrusted browserslist-stats.json, opts.stats, or --stats keys with for...in, then reads and writes plain objects without own-property checks. Reachability requires control of a statistics file in the project directory tree or influence over programmatic statistics data; a matching inherited key triggers an uncaught TypeError on the next Browserslist call.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Prototype pollution in Browserslist before 4.28.7 allows attackers to crash invoking processes through crafted custom statistics. normalizeStats() iterates untrusted browserslist-stats.json, opts.stats, or --stats keys with for...in, then reads and writes plain objects without own-property checks. Reachability requires control of a statistics file in the project directory tree or influence over programmatic statistics data; a matching inherited key triggers an uncaught TypeError on the next Browserslist call.

The record

CVE
CVE-2026-73088
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Browserslist
Product
Browserslist
Classifications
CWE-248, CWE-1321, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=< 4.28.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Browserslist · Browserslistversion=< 4.28.7

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-248Uncaught Exception
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1499.004Endpoint Denial of Service: Application 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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