HIGH

CVE-2026-73088

CVSS v3

7.5

HIGH

EPSS Score

0.7 %

exploit probability, as of 2026-10-17

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

browserslistnpmall versions · fixed in 4.28.7

Vendor advisories

CVE-2026-73088 Red Hat Product Security105 products fixed · 45 known affected
browserslist: Browserslist: Prototype pollution leading to denial of service
workload-availability/node-healthcheck-must-gather-rhel9 as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-operator-bundle as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-rhel9-operator as a component of Node HealthCheck Operator
RHSA-2026:83598 Red Hat Product Security1 product fixed
Red Hat Security Advisory: RHTAS 1.4.4 - Red Hat Trusted Artifact Signer Release
RHSA-2026:70829 Red Hat Product Security1 product fixed
Red Hat Security Advisory: RHTAS 1.3.8 - Red Hat Trusted Artifact Signer Release
RHSA-2026:70267 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Quay 3.14.9
RHSA-2026:68765 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image
RHSA-2026:68755 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image

24 more advisories

Full record on NVD

Description

Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, normalizeStats() in node.js, reached unconditionally through getStat() and loadStat() on every browserslist() call, processes untrusted browserslist-stats.json, opts.stats, and CLI --stats data with an unguarded for...in loop and plain-object bracket access and assignment, allowing inherited Object.prototype keys including __proto__, toString, valueOf, constructor, hasOwnProperty, and isPrototypeOf to cause an uncaught TypeError or modify the prototype of the returned normalized object. This issue is fixed in version 4.28.7.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-08-11
Last Modified: 2026-08-11

Frequently asked questions

What is CVE-2026-73088?

Is CVE-2026-73088 actively exploited?

Active exploitation of CVE-2026-73088 has not been confirmed. Its EPSS score was 0.7% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-73088?

CVE-2026-73088 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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