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Fencer Vulns
medium 6.5

CVE-2026-33750 json

brace-expansion: Zero-step sequence causes process hang and memory exhaustion

published 2026-03-26 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-16620 , GHSA-f886-m6hf-6m8v

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, a brace pattern with a zero step value (e.g., `{1..2..0}`) causes the sequence generation loop to run indefinitely, making the process hang for seconds and allocate heaps of memory. Versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13 fix the issue. As a workaround, sanitize strings passed to `expand()` to ensure a step value of `0` is not used.

Patch / fix

  • npm brace-expansion 1.1.13, 2.0.3, 3.0.2, 5.0.5
  • brace_expansion_project brace_expansion 1.1.13, 2.0.3, 3.0.2, 5.0.5
  • juliangruber brace-expansion 1.1.13, 2.0.3, 3.0.2, 5.0.5
  • node-brace-expansion Debian 14 2.0.3+~1.1.2-1

debian advisories DEBIAN-CVE-2026-33750

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-2026-33750 updated cvss 6.5

brace-expansion: brace-expansion: Denial of Service via zero step value in brace pattern

  • Red Hat Cryostat 4 brace-expansion Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Migration Toolkit for Applications 8 mta/mta-ui-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel9 Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-compat-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Node HealthCheck Operator workload-availability/node-remediation-console-rhel8, workload-availability/node-remediation-console-rhel9, workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Pipelines openshift-pipelines/pipelines-console-plugin-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9, +3 more
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8, openshift-service-mesh/kiali-ossmc-rhel8
    affected: no fix planned “Out of support scope”
show 14 more
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/kiali-ossmc-rhel9, openshift-service-mesh/kiali-rhel9-operator, openshift-service-mesh/kiali-operator-bundle
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat 3scale API Management Platform 2 3scale-amp20/system, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp24/system, 3scale-amp25/system, 3scale-amp26/system, +3 more Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8 Red Hat AMQ Broker 7 brace-expansion
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 automation-gateway, automation-platform-ui, automation-eda-controller, ansible-on-clouds/aoc-azure-aap-installer-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat build of Apache Camel - HawtIO 4 brace-expansion Red Hat build of Apicurio Registry 2 brace-expansion Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8, apicurio/apicurio-registry-ui-rhel9 Red Hat Build of Keycloak brace-expansion Red Hat Build of Podman Desktop podman-desktop-macos-1-0, podman-desktop-windows-1-0 Red Hat Build of Podman Desktop - Tech Preview rhdesktop/rh-podman-desktop-ext-sandbox-rhel10
    +2 more products
    Red Hat Data Grid 8 brace-expansion Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/backstage-community-plugin-catalog-backend-module-scaffolder-relation-processor
    affected: no fix available “Fix deferred”
  • Red Hat Directory Server 11 389-ds-base
    affected: no fix planned “Out of support scope”
  • Red Hat Directory Server 12 389-ds-base
    affected: no fix available “Fix deferred”
  • Red Hat Directory Server 13 389-ds-base
    affected: no fix planned “Out of support scope”
  • Red Hat Edge Manager 1 rhem/flightctl-ui-rhel9, rhem/flightctl-ui-ocp-rhel9 Red Hat Enterprise Linux 8 npm, pcs, nodejs, grafana, mozjs60, pcs-snmp, +18 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 gjs, npm, pcs, rust, cargo, clippy, +18 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 rust, nodejs22, nodejs24, nodejs-nodemon Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Fuse 7 brace-expansion Red Hat JBoss Enterprise Application Platform 7 brace-expansion
    affected: no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 8 brace-expansion Red Hat JBoss Enterprise Application Platform Expansion Pack brace-expansion
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-dashboard-rhel8, rhoai/odh-model-registry-rhel8, rhoai/odh-notebook-controller-rhel8, rhoai/odh-kf-notebook-controller-rhel8, rhoai/odh-data-science-pipelines-argo-argoexec-rhel8, +1 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9, openshift4/ose-monitoring-plugin-rhel9, openshift4/nmstate-console-plugin-rhel9, openshift4/ose-agent-installer-ui-rhel9, openshift4/ose-networking-console-plugin-rhel9
    affected: no fix available “Fix deferred”

9 more affected, 2 more fixed, 4 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
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 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 brace-expansion
>=4.0.0, <5.0.5
>=3.0.0, <3.0.2
>=2.0.0, <2.0.3
<1.1.13
5.0.5
3.0.2
2.0.3
1.1.13

Affected products

  • juliangruber brace-expansion

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns 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.

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