deepmerge through 4.3.1 Prototype Poisoning via mergeObject
Priority HIGH 77CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00514 43rd percentileScored 2026-11-02
Fix No fix listed No fixed version in the sources yet
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TehShrike | deepmerge | up to 4.3.1 | — | No fix listed | CNA |
| — | deepmerge (npm) | 4.2.0 – 4.3.1 | — | No fix listed | GHSA-gcqx-w48m-w2h4 |
- deepmerge VendorTehShrike Affected up to 4.3.1 Fixed in — No fix listed CNA
- deepmerge (npm) Vendor— Affected 4.2.0 – 4.3.1 Fixed in — No fix listed GHSA-gcqx-w48m-w2h4
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cost Management On Premise | Affected | No fix yet: Fix deferred |
| Cryostat 4 | Affected | No fix yet |
| Multicluster Engine for Kubernetes | Affected | No fix yet |
| Node HealthCheck Operator | Affected | No fix yet |
| OpenShift Pipelines | Affected | No fix yet |
| Red Hat AMQ Broker 7 | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat Advanced Cluster Security 4 | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat Build of Keycloak | Affected | No fix yet |
| Red Hat Build of Podman Desktop | Affected | No fix yet |
| Red Hat Ceph Storage 9 | Affected | No fix yet: Fix deferred |
| Red Hat Certification Program for Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Connectivity Link 1 | Affected | No fix yet |
| Red Hat Developer Hub 1 | Affected | No fix yet |
| Red Hat Edge Manager 1 | Affected | No fix yet |
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet |
| Red Hat Fuse 7 | Affected | No fix planned: Will not fix |
| Red Hat Hardened Images | Affected | No fix planned: Will not fix |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix yet |
| Red Hat OpenShift Virtualization 4 | Affected | No fix yet |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet |
| Red Hat Satellite 6 | Affected | No fix yet |
| Red Hat Single Sign-On 7 | Affected | No fix planned: Will not fix |
| Red Hat build of Apache Camel - HawtIO 4 | Affected | No fix yet |
| Secrets Management Console for Red Hat OpenShift | Affected | No fix planned: Will not fix |
| Self-service automation portal 2 | Affected | No fix yet |
Not affected: 18 products
- OpenShift Service Mesh 3
- Red Hat 3scale API Management Platform 2
- Red Hat AMQ Broker 7
- Red Hat Ansible Automation Platform 2
- Red Hat Data Grid 8
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
- Red Hat JBoss Enterprise Application Platform 8
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift Dev Spaces
- Red Hat Quay 3
- Red Hat Quay 5
- Red Hat build of Apache Camel for Spring Boot 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-93753
- 2026-10-03 Alias added: GHSA-gcqx-w48m-w2h4
- 2026-10-20 Affected versions changed · Red Hat
- 2026-10-20 CVSS score added · Red Hat
- 2026-10-26 Affected versions changed · Red Hat
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-27 Affected versions changed · GHSA-gcqx-w48m-w2h4
- 2026-10-27 CVSS score added · GHSA-gcqx-w48m-w2h4
- 2026-10-27 Weakness changed · GHSA-gcqx-w48m-w2h4
- 2026-10-27 4 new references · GHSA-gcqx-w48m-w2h4
- 2026-10-29 Affected versions changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-11-02 Affected versions changed · Red Hat
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-05 Affected versions changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-08 Affected versions changed · Red Hat
References
Sources
- CVE-2026-93753 · CVE Program
- CVE-2026-93753 · NVD
- FIRST EPSS
- GHSA-gcqx-w48m-w2h4 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-93753 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences