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TI-2026-51727 Aliases CVE-2026-73643GHSA-pm4m-ph32-ghv5

js-yaml: Exponential parsing time in the flow collections leads to denial of service

Priority HIGH 72CWE-407Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 16 fixed, 13 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-407.

Summary

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 until 5.2.2, parsing a small YAML document can take exponential time when an application calls load() or loadAll() on untrusted input. In src/parser/parser.ts, readFlowCollection uses restoreState and calls parseNode a second time when a flow-sequence entry is recognized as a key: value pair. If the key is a nested flow sequence of the same shape, every level is parsed twice, causing O(2^n) work and allowing an input under 200 bytes to keep one CPU busy for minutes, block the Node.js event loop, and stall the process. No anchors, aliases, merges, tags, or nondefault options are required. This issue is fixed in version 5.2.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00488 42nd percentileScored 2026-11-07
Fix Partial js-yaml (nodeca): 5.2.2js-yaml (npm): 5.2.2Red Hat: 19 advisoriesRed Hat: 16 fixed, 13 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nodecajs-yaml5.0.0 to before 5.2.25.2.2Patch availableCNA
—js-yaml (npm)5.0.0 to before 5.2.25.2.2Patch availableGHSA-pm4m-ph32-ghv5
  • js-yaml Vendornodeca Affected 5.0.0 to before 5.2.2 Fixed in 5.2.2 Patch available CNA
  • js-yaml (npm) Vendor— Affected 5.0.0 to before 5.2.2 Fixed in 5.2.2 Patch available GHSA-pm4m-ph32-ghv5

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:*:*:*——nodeca
  • cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:*:*:* Versions — — ·nodeca

Remediation

  • Fix · CNA js-yaml (nodeca) Fixed in 5.2.2
  • Fix · GHSA-pm4m-ph32-ghv5 js-yaml (npm) Fixed in 5.2.2 Advisory →

Red Hat 19 advisories

  • RHSA-2026:92650 Released 2026-10-29 · Red Hat rating Important
    Red Hat OpenShift Data Foundation 4.19.26 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.19 registry.redhat.io/odf4/cephcsi-rhel9, registry.redhat.io/odf4/cephcsi-rhel9-operator, registry.redhat.io/odf4/mcg-core-rhel9 +17
  • RHSA-2026:92510 Released 2026-10-29 · Red Hat rating Critical
    RHOAI 3.4.6 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
  • RHSA-2026:84734 Released 2026-10-19 · Red Hat rating Critical
    RHOAI 3.4.5 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-ai-gateway-payload-processing-rhel9, registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9 +47
Show 16 more Red Hat advisories
  • RHSA-2026:83598 Released 2026-10-15 · Red Hat rating Important
    RHTAS 1.4.4 - Red Hat Trusted Artifact Signer Release
    • Red Hat Trusted Artifact Signer 1.4 registry.redhat.io/rhtas/certificate-transparency-rhel9, registry.redhat.io/rhtas/fulcio-rhel9, registry.redhat.io/rhtas/rekor-backfill-redis-rhel9 +6
  • RHSA-2026:70618 Released 2026-10-01 · Red Hat rating Important
    OpenShift Container Platform 4.18.56 security and extras update
    • Red Hat OpenShift Container Platform 4.18 registry.redhat.io/openshift4/nmstate-console-plugin-rhel9, registry.redhat.io/openshift4/ose-clusterresourceoverride-rhel9, registry.redhat.io/openshift4/ose-clusterresourceoverride-rhel9-operator +3
  • RHSA-2026:70588 Released 2026-10-01 · Red Hat rating Important
    OpenShift Container Platform 4.17.58 security and extras update
    • Red Hat OpenShift Container Platform 4.17 registry.redhat.io/openshift4/ingress-node-firewall-rhel9, registry.redhat.io/openshift4/ingress-node-firewall-rhel9-operator, registry.redhat.io/openshift4/nmstate-console-plugin-rhel9 +9
  • RHSA-2026:68681 Released 2026-09-17 · Red Hat rating Important
    Migration Toolkit for Containers (MTC) 1.8.17 update
    • Red Hat Migration Toolkit 1.8 registry.redhat.io/rhmtc/openshift-migration-registry-rhel8, registry.redhat.io/rhmtc/openshift-migration-ui-rhel8
  • RHSA-2026:68254 Released 2026-09-16 · Red Hat rating Important
    Red Hat Edge Manager Version 1.2.1 Security Update
    • Red Hat Edge Manager 1.2 registry.redhat.io/rhem/flightctl-alert-exporter-rhel9, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel9, registry.redhat.io/rhem/flightctl-api-rhel9 +11
  • RHSA-2026:68253 Released 2026-09-16 · Red Hat rating Important
    Red Hat Edge Manager Version 1.1.4 Security Update
    • Red Hat Edge Manager 1.1 registry.redhat.io/rhem/flightctl-alert-exporter-rhel9, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel9, registry.redhat.io/rhem/flightctl-api-rhel9 +10
  • RHSA-2026:68044 Released 2026-09-16 · Red Hat rating Important
    Red Hat Edge Manager Version 1.1.4 Security Update
    • Red Hat Edge Manager 1.1 registry.redhat.io/rhem/flightctl-alert-exporter-rhel10, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel10, registry.redhat.io/rhem/flightctl-api-rhel10 +11
  • RHSA-2026:68006 Released 2026-09-16 · Red Hat rating Important
    Red Hat Edge Manager Version 1.2.1 Security Update
    • Red Hat Edge Manager 1.2 registry.redhat.io/rhem/flightctl-alert-exporter-rhel10, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel10, registry.redhat.io/rhem/flightctl-api-rhel10 +11
  • RHSA-2026:66003 Released 2026-09-09 · Red Hat rating Important
    Ansible automation portal Red Hat Enterprise Linux Images
    • Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9
  • RHSA-2026:63050 Released 2026-09-09 · Red Hat rating Important
    OpenShift Container Platform 4.19.46 security and extras update
    • Red Hat OpenShift Container Platform 4.19 registry.redhat.io/openshift4/ingress-node-firewall-rhel9, registry.redhat.io/openshift4/ingress-node-firewall-rhel9-operator, registry.redhat.io/openshift4/kube-compare-artifacts-rhel9 +5
  • RHSA-2026:65126 Released 2026-09-08 · Red Hat rating Important
    RHOAI 2.25.11 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-caikit-tgis-serving-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
  • RHSA-2026:60447 Released 2026-09-01 · Red Hat rating Important
    OpenShift Container Platform 4.20.36 security and extras update
    • Red Hat OpenShift Container Platform 4.20 registry.redhat.io/openshift4/nmstate-console-plugin-rhel9, registry.redhat.io/openshift4/ose-aws-efs-csi-driver-container-rhel9, registry.redhat.io/openshift4/ose-cluster-capacity-rhel9 +1
  • RHSA-2026:60442 Released 2026-09-01 · Red Hat rating Important
    OpenShift Container Platform 4.22.12 security and extras update
    • Red Hat OpenShift Container Platform 4.22 registry.redhat.io/openshift4/nmstate-console-plugin-rhel9, registry.redhat.io/openshift4/ose-aws-efs-csi-driver-container-rhel9, registry.redhat.io/openshift4/ose-aws-efs-csi-driver-rhel9-operator +2
  • RHSA-2026:60478 Released 2026-09-01 · Red Hat rating Important
    OpenShift Container Platform 4.21.31 security and extras update
    • Red Hat OpenShift Container Platform 4.21 registry.redhat.io/openshift4/nmstate-console-plugin-rhel9, registry.redhat.io/openshift4/ose-cluster-capacity-rhel9
  • RHSA-2026:61783 Released 2026-08-31 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:61314 Released 2026-08-31 · Red Hat rating Important
    Cluster Observability Operator 1.5.2
    • Cluster Observability Operator 1.5 registry.redhat.io/cluster-observability-operator/alertmanager-rhel9, registry.redhat.io/cluster-observability-operator/cluster-health-analyzer-rhel9, registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator +10

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Node HealthCheck OperatorAffectedNo fix yet
OpenShift LightspeedAffectedNo fix yet
OpenShift PipelinesAffectedNo fix yet
Red Hat Advanced Cluster Security 4AffectedNo fix planned: Will not fix
Red Hat Ceph Storage 4AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 9AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Red Hat OpenShift GitOpsAffectedNo fix planned: Will not fix
Red Hat Openshift Data Foundation 4AffectedNo fix yet
Red Hat Trusted Artifact SignerAffectedNo fix planned: Will not fix
Red Hat Trusted Profile AnalyzerAffectedNo fix planned: Will not fix
Secrets Management Console for Red Hat OpenShiftAffectedNo fix planned: Will not fix
Cluster Observability Operator 1.5Fixed RHSA-2026:61314
Red Hat Ansible Automation Platform 2.2Fixed RHSA-2026:66003
Red Hat Discovery 2Fixed RHSA-2026:61783
Red Hat Edge Manager 1.1Fixed RHSA-2026:68044, RHSA-2026:68253
Red Hat Edge Manager 1.2Fixed RHSA-2026:68006, RHSA-2026:68254
Red Hat Migration Toolkit 1.8Fixed RHSA-2026:68681
Red Hat OpenShift AI 2.25Fixed RHSA-2026:65126
Red Hat OpenShift AI 3.4Fixed RHSA-2026:84734, RHSA-2026:92510
Red Hat OpenShift Container Platform 4.17Fixed RHSA-2026:70588
Red Hat OpenShift Container Platform 4.18Fixed RHSA-2026:70618
Red Hat OpenShift Container Platform 4.19Fixed RHSA-2026:63050
Red Hat OpenShift Container Platform 4.20Fixed RHSA-2026:60447
Red Hat OpenShift Container Platform 4.21Fixed RHSA-2026:60478
Red Hat OpenShift Container Platform 4.22Fixed RHSA-2026:60442
Red Hat Openshift Data Foundation 4.19Fixed RHSA-2026:92650
Red Hat Trusted Artifact Signer 1.4Fixed RHSA-2026:83598
Not affected: 60 products
  • Cluster Observability Operator 1.5
  • Cryostat 4
  • Gatekeeper 3
  • Migration Toolkit for Applications 8
  • Multicluster Engine for Kubernetes
  • Network Observability Operator
  • OpenShift Service Mesh 3
  • Red Hat 3scale API Management Platform 2
  • Red Hat AMQ Broker 7
  • Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Ansible Automation Platform 2
  • Red Hat Build of Keycloak
  • Red Hat Build of Podman Desktop
  • Red Hat Ceph Storage 4
  • Red Hat Ceph Storage 6
  • Red Hat Ceph Storage 7
  • Red Hat Ceph Storage 8
  • Red Hat Ceph Storage 9
  • Red Hat Certification Program for Red Hat Enterprise Linux 9
  • Red Hat Connectivity Link 1
  • Red Hat Data Grid 8
  • Red Hat Developer Hub 1
  • Red Hat Directory Server 11
  • Red Hat Directory Server 12
  • Red Hat Directory Server 13
  • Red Hat Discovery 2
  • Red Hat Edge Manager 1.1
  • Red Hat Edge Manager 1.2
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Hardened Images
  • Red Hat JBoss Enterprise Application Platform 7
  • Red Hat JBoss Enterprise Application Platform 8
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Migration Toolkit 1.8
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 2.25
  • Red Hat OpenShift AI 3.4
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 4.17
  • Red Hat OpenShift Container Platform 4.18
  • Red Hat OpenShift Container Platform 4.19
  • Red Hat OpenShift Container Platform 4.20
  • Red Hat OpenShift Container Platform 4.21
  • Red Hat OpenShift Container Platform 4.22
  • Red Hat OpenShift Container Platform 5
  • Red Hat OpenShift Dev Spaces
  • Red Hat OpenShift GitOps
  • Red Hat OpenShift Virtualization 4
  • Red Hat Openshift Data Foundation 4.19
  • Red Hat Quay 3
  • Red Hat Satellite 6
  • Red Hat Single Sign-On 7
  • Red Hat Trusted Artifact Signer 1.4
  • Red Hat build of Apache Camel for Spring Boot 4
  • Red Hat build of Apicurio Registry 3
  • Self-service automation portal 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73643
  2. 2026-10-03 Alias added: GHSA-pm4m-ph32-ghv5
  3. 2026-10-16 Fix available: RHSA-2026:83598 · Red Hat
  4. 2026-10-16 Fix available: Red Hat Trusted Artifact Signer 1.4 · Red Hat
  5. 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
  6. 2026-10-20 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
  7. 2026-10-21 Affected versions changed · Red Hat
  8. 2026-10-27 Affected versions changed · Red Hat
  9. 2026-10-30 Fix available: RHSA-2026:92510 · Red Hat
  10. 2026-10-30 Affected versions changed · Red Hat
  11. 2026-10-30 Affected versions changed · Red Hat
  12. 2026-10-30 Fix available: Red Hat Openshift Data Foundation 4.19 · Red Hat
  13. 2026-10-31 Fix available: RHSA-2026:92650 · Red Hat
  14. 2026-11-05 Fix available: Cluster Observability Operator 1.5 · Red Hat

References

Other 4

  • TI-2026-66141 probe-image-size: Quadratic-time Denial of Service in the SVG Parser CVSS 3.1HIGH 7.5
  • TI-2026-42685 js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing CVSS 3.1HIGH 7.5
  • TI-2026-42684 js-yaml: YAML merge-key chains can force quadratic CPU consumption CVSS 3.1HIGH 7.5
  • TI-2026-42683 js-yaml: YAML merge-key chains can force quadratic CPU consumption CVSS 3.1HIGH 7.5
  • TI-2013-04085 The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the… CVSS 2.0MEDIUM 6.8
  • TI-2026-57986 js-yaml: maxTotalMergeKeys does not limit CPU use for empty merge sources CVSS 3.1HIGH 7.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences