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CVE-2026-29063

CRITICALCVSS 9.8/10EPSS 1.01%

Last modified

CVE-2026-29063 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. EPSS estimates a 1.01% chance of exploitation in the next 30 days.

Description

Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0
8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
1.01%

63.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Immutable-JsImmutable>= 3.0.0, < 3.8.3
Immutable-JsImmutable>= 4.0.0, < 4.3.8
Immutable-JsImmutable>= 5.0.0, < 5.1.5
Redhat3scale Api Management Platform2.0
RedhatAdvanced Cluster Management For Kubernetes>= 2.14, < 2.14.3
RedhatAdvanced Cluster Management For Kubernetes>= 2.15, < 2.15.2
RedhatAdvanced Cluster Management For Kubernetes>= 2.16, < 2.16.1
RedhatAdvanced Cluster Security>= 4.8.0, < 4.8.11
RedhatAdvanced Cluster Security>= 4.9.0, < 4.9.6
RedhatAdvanced Cluster Security>= 4.10.0, < 4.10.2
RedhatAnsible Automation Platform2.0
RedhatBuild Of Apicurio Registry2.0
RedhatConnectivity Link1.0
RedhatDeveloper Hub>= 1.8.0, < 1.8.6
RedhatDeveloper Hub>= 1.9.0, < 1.9.4
RedhatDiscovery2.0
RedhatEdge Manager>= 1.0, < 1.0.3
RedhatEdge Manager>= 1.1, < 1.1.3
RedhatLogging Subsystem For Red Hat OpenshiftAll versions
RedhatMigration Toolkit1.8
RedhatMigration Toolkit For Virtualization2.9.0
RedhatMigration Toolkit For Virtualization2.10.0
RedhatMulticluster Engine For Kubernetes>= 2.6, < 2.6.10
RedhatMulticluster Engine For Kubernetes>= 2.7, < 2.7.10
RedhatMulticluster Engine For Kubernetes>= 2.8, < 2.8.5
RedhatMulticluster Engine For Kubernetes>= 2.9, < 2.9.3
RedhatMulticluster Engine For Kubernetes>= 2.10, < 2.10.2
RedhatMulticluster Engine For Kubernetes>= 2.11, < 2.11.1
RedhatNetwork Observability Operator1.11.0
RedhatNetwork Observability Operator1.12.3
RedhatOpenshift Cluster Observability Operator1.5.3
RedhatOpenshift Container Platform>= 4.12, < 4.12.93
RedhatOpenshift Container Platform>= 4.13, < 4.13.69
RedhatOpenshift Container Platform>= 4.14, < 4.14.68
RedhatOpenshift Container Platform>= 4.15, < 4.15.66
RedhatOpenshift Container Platform>= 4.16, < 4.16.63
RedhatOpenshift Container Platform>= 4.17, < 4.17.54
RedhatOpenshift Container Platform>= 4.18, < 4.18.39
RedhatOpenshift Container Platform>= 4.19, < 4.19.32
RedhatOpenshift Container Platform>= 4.20, < 4.20.23
RedhatOpenshift Container Platform>= 4.21, < 4.21.17
RedhatOpenshift Container Platform4.0
RedhatOpenshift Data Foundation>= 4.18, < 4.18.25
RedhatOpenshift Data Foundation>= 4.19, < 4.19.20
RedhatOpenshift Data Foundation>= 4.20, < 4.20.15
RedhatOpenshift Data Foundation4.17
RedhatOpenshift GitopsAll versions
RedhatOpenshift LightspeedAll versions
RedhatOpenshift Pipelines>= 1.20, < 1.20.5
RedhatOpenshift Service Mesh2.6

Showing 50 of 68 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-29063?
Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.
How severe is CVE-2026-29063?
CVE-2026-29063 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.01% probability of exploitation in the next 30 days.
How do I fix CVE-2026-29063?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST