Prototype Pollution in immerjs/immer
Priority MEDIUM 45CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 fixed, 4 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-915.
Summary
immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Why it matters now
EPSS 0.01664 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial immer (npm): 9.0.6Red Hat: 1 advisoryRed Hat: 1 fixed, 4 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| immerjs | immerjs/immer | up to 9.0.5 | — | No fix listed | CNA |
| — | immer (npm) | 7.0.0 to before 9.0.6 | 9.0.6 | Patch available | GHSA-c36v-fmgq-m8hx |
- immerjs/immer Vendorimmerjs Affected up to 9.0.5 Fixed in — No fix listed CNA
- immer (npm) Vendor— Affected 7.0.0 to before 9.0.6 Fixed in 9.0.6 Patch available GHSA-c36v-fmgq-m8hx
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:immer_project:immer:*:*:*:*:*:node.js:*:* | up to 9.0.5 | Vulnerable | Immer Project |
- cpe:2.3:a:immer_project:immer:*:*:*:*:*:node.js:*:* Versions up to 9.0.5 Vulnerable ·Immer Project
Remediation
- Fix · GHSA-c36v-fmgq-m8hx immer (npm) Fixed in 9.0.6 Advisory →
Red Hat 1 advisory
- RHSA-2021:4848 Released 2021-11-29 · Red Hat rating ModerateMigration Toolkit for Containers (MTC) 1.5.2 security update and bugfix advisory
- 8Base-RHMTC-1.5 rhmtc/openshift-migration-controller-rhel8, rhmtc/openshift-migration-ui-rhel8
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Service Mesh 1 | Affected | No fix planned: Out of support scope |
| OpenShift Service Mesh 2.0 | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| 8Base-RHMTC-1.5 | Fixed | RHSA-2021:4848 |
Not affected: 2 products
- 7Server-RHMTC-1.5
- 8Base-RHMTC-1.5
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3757
- 2026-10-03 Alias added: GHSA-c36v-fmgq-m8hx
References
More Immer Project Immer vulnerabilities
- TI-2021-06128 Prototype pollution in immer CVSS 3.1CRITICAL 9.8
- TI-2020-17287 Prototype pollution in immer CVSS 3.1HIGH 7.5
Sources
- CVE-2021-3757 · CVE Program
- CVE-2021-3757 · NVD
- FIRST EPSS
- GHSA-c36v-fmgq-m8hx · GitHub Advisory Database · CC BY 4.0
- CVE-2021-3757 · 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