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Fencer Intel
high 7.5

CVE-2026-73088 json

Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)

published 3mo ago modified 2mo ago also EUVD-2026-56285 , GHSA-73wf-gq98-2v4g

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm browserslist 4.28.7
  • browserslist_project browserslist 4.28.7
  • node-browserslist Debian 14 4.28.7+~cs8.16.65-1

debian advisories DEBIAN-CVE-2026-73088

  • grafana12.4 hummingbird 1 12.4.8-0.1.1.hum1
  • grafana13.1 hummingbird 1 13.1.3-0.1.1.hum1

red hat advisories RHSA-2026:54518RHSA-2026:54517

  • agama-web-ui openSUSE Tumbleweed 24+0.a836cced5-52.1
  • python-pytest-html openSUSE Leap 16.0 4.1.1-bp160.5.1
  • bun openSUSE Tumbleweed 1.4.0~git20260808.52bf09cb-2.1
  • python-pytest-html openSUSE Tumbleweed 4.2.0-5.1

opensuse advisories openSUSE-SU-2026:11680-1openSUSE-SU-2026:21602-1openSUSE-SU-2026:11535-1openSUSE-SU-2026:11540-1

Is CVE-2026-73088 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73088 updated cvss 7.5

browserslist: Browserslist: Prototype pollution leading to denial of service

  • Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-agentic-console-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/lightspeed-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat build of Apache Camel - HawtIO 4 browserslist 4.21.5 Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0 Red Hat Ceph Storage 9 rhceph/alloy-rhel10 Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9 Red Hat Edge Manager 1 rhem/flightctl-ui-rhel9 Red Hat Enterprise Linux 8 cockpit-composer
    +1 more products
    Red Hat Enterprise Linux 9 gjs 1.68.6-4.el9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rust 1.97.1-1.el10, rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 7 jboss-eap-patch.zip, jboss-eap-maven-repository.zip, jboss-eap-full-maven-repository.zip, jboss-eap-runtime-maven-repository.zip, jboss-eap-incremental-maven-repository.zip
    affected: workaround, no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 8 jboss-eap.1-runtime-maven-repository.zip 8.1.0 Red Hat OpenShift Container Platform 5 openshift5/nmstate-console-plugin-rhel9 Red Hat Openshift Data Foundation 4 odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 browserslist 4.21.5 Red Hat Secrets Management Console for Red Hat OpenShift external-secrets-management/console-plugin-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2.1 ansible-automation-platform/automation-portal 1787047114
    fixed: vendor fix RHSA-2026:56338
show 21 more
  • Red Hat Ansible Automation Platform 2.2 ansible-automation-platform/automation-portal 1787047188
    fixed: vendor fix RHSA-2026:56357
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1786634825
    fixed: vendor fix RHSA-2026:54760
  • Red Hat Edge Manager 1.1 rhem/flightctl-ui-rhel10 1789486181, rhem/flightctl-ui-ocp-rhel9 1789486446, rhem/flightctl-ui-ocp-rhel10 1789486226
    fixed: vendor fix RHSA-2026:68044
  • Red Hat Hardened Images grafana12.4 12.4.8-0.1.1.hum1, grafana13.1 13.1.3-0.1.1.hum1
    fixed: vendor fix RHSA-2026:54518
  • Red Hat Migration Toolkit 1.8 rhmtc/openshift-migration-ui-rhel8 1789546373
    fixed: vendor fix RHSA-2026:68681
  • Red Hat OpenShift AI 2.25 rhoai/odh-dashboard-rhel9 1788312226, rhoai/odh-feature-server-rhel9 1792148523, rhoai/odh-mod-arch-model-registry-rhel9 1788312157
    fixed: vendor fix RHSA-2026:65126
  • Red Hat OpenShift AI 3.4 rhoai/odh-dashboard-rhel9 1791861020, rhoai/odh-mod-arch-maas-rhel9 1793001859, rhoai/odh-feature-server-rhel9 1791863220, rhoai/odh-mod-arch-automl-rhel9 1791861032, rhoai/odh-mod-arch-gen-ai-rhel9 1791861479, rhoai/odh-mod-arch-mlflow-rhel9 1793001851, +3 more
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift Container Platform 4.21 openshift4/nmstate-console-plugin-rhel9 1787590372
    fixed: vendor fix RHSA-2026:60478
  • Red Hat OpenShift Container Platform 4.22 openshift4/nmstate-console-plugin-rhel9 1787744843
    fixed: vendor fix RHSA-2026:60442
  • Red Hat Openshift Data Foundation 4.19 odf4/odf-console-rhel9 1793126829
    fixed: vendor fix RHSA-2026:92650
  • Red Hat OpenShift Dev Spaces 3.30 devspaces/openvsx-rhel9 1789144269, devspaces/dashboard-rhel9 1789162884
    fixed: vendor fix RHSA-2026:68754
  • Red Hat OpenShift Service Mesh 3.0 openshift-service-mesh/kiali-rhel9 1787076495, openshift-service-mesh/kiali-ossmc-rhel9 1787077028
    fixed: vendor fix RHSA-2026:59548
  • Red Hat OpenShift Service Mesh 3.1 openshift-service-mesh/kiali-rhel9 1787092198, openshift-service-mesh/kiali-ossmc-rhel9 1787075730
    fixed: vendor fix RHSA-2026:59561
  • Red Hat OpenShift Service Mesh 3.2 openshift-service-mesh/kiali-rhel9 1787092255, openshift-service-mesh/kiali-ossmc-rhel9 1787077188
    fixed: vendor fix RHSA-2026:59554
  • Red Hat OpenShift Service Mesh 3.3 openshift-service-mesh/kiali-rhel9 1787077108, openshift-service-mesh/kiali-ossmc-rhel9 1787076322
    fixed: vendor fix RHSA-2026:59566
  • Red Hat OpenShift Service Mesh 3.4 openshift-service-mesh/kiali-rhel9 1787165683, openshift-service-mesh/kiali-ossmc-rhel9 1787166293
    fixed: vendor fix RHSA-2026:59583
  • Red Hat Quay 3.9 quay/quay-rhel8 1788595574
    fixed: vendor fix RHSA-2026:65514
  • Red Hat Quay 3.10 quay/quay-rhel8 1788561841
    fixed: vendor fix RHSA-2026:66084
  • Red Hat Quay 3.12 quay/quay-rhel8 1788594376
    fixed: vendor fix RHSA-2026:66523
  • Red Hat Quay 3.14 quay/quay-rhel8 1788593843
    fixed: vendor fix RHSA-2026:70267
  • Red Hat Quay 3.15 quay/quay-rhel8 1788191755
    fixed: vendor fix RHSA-2026:63307

4 more fixed, 38 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm browserslist
<4.28.7
4.28.7

Affected products

  • browserslist browserslist

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
  • CWE-248 Uncaught Exception

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of browserslist/browserslist published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.