JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection
Summary
| CVE | CVE-2026-46625 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-10 22:16:59 UTC |
| Updated | 2026-09-09 13:20:18 UTC |
| Description | JavaScript Cookie is a JavaScript API for handling cookies, client-side. Prior to version 3.0.7, js-cookie's internal assign() helper copies properties with for...in + plain assignment. When the source object is produced by JSON.parse, the JSON object's "__proto__" member is an own enumerable property, so the for…in enumerates it and the target[key] = source[key] write triggers the Object.prototype.__proto__ setter on the fresh target ({}). The result is a per-instance prototype hijack: Object.prototype itself is untouched, but the merged attributes object now inherits attacker-controlled keys. Because the consuming set() function then enumerates the merged object with another for...in, every key the attacker placed on the polluted prototype lands in the resulting Set-Cookie string as an attribute pair. The attacker can set domain=, secure=, samesite=, expires=, and path= on cookies whose attributes the developer thought were locked down. This issue has been patched in version 3.0.7. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.009190000 probability, percentile 0.581600000 (date 2026-09-09)
Problem Types: CWE-1321 | CWE-915 | CWE-1321 CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') | CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Js-cookie | Javascript Cookie | All | All | All | All |
| Application | Redhat | 3scale Api Management | 2.0 | All | All | All |
| Application | Redhat | Ansible Automation Platform | 2.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
| Application | Redhat | Openshift Ai | - | All | All | All |
| Application | Redhat | Openshift Lightspeed | - | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Js-cookie | Js-cookie | affected < 3.0.7 | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-13 * rpm | Not specified |
| ADP | Red Hat | Red Hat Advanced Cluster Security For Kubernetes 4.10 | unaffected 1783357140 * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.1 | unaffected 1787047114 * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.2 | unaffected 1787047188 * rpm | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2.7 | unaffected 1787218409 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.10 | unaffected 1785333413 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.10 | unaffected 1785340831 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.10 | unaffected 1785332928 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.10 | unaffected 1785411652 * rpm | Not specified |
| ADP | Red Hat | Red Hat Developer Hub 1.9 | unaffected 1785972843 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1787347991 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1787250508 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1787251550 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1786611759 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1787251250 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1786612219 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 3.4 | unaffected 1787250617 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Service Mesh 3.3 | unaffected 1782231869 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Service Mesh 3.3 | unaffected 1782201466 * rpm | Not specified |
| ADP | Red Hat | OpenShift Lightspeed | Not specified | Not specified |
| ADP | Red Hat | OpenShift Lightspeed | Not specified | Not specified |
| ADP | Red Hat | Red Hat 3scale API Management Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat 3scale API Management Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat 3scale API Management Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat 3scale API Management Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat 3scale API Management Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Discovery 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:59153 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| github.com/js-cookie/js-cookie/commit/eb3c40e89731e99b8970faaf35ddad249c... | [email protected] | github.com | Patch |
| github.com/js-cookie/js-cookie/releases/tag/v3.0.7 | [email protected] | github.com | Release Notes |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46625.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | Third Party Advisory |
| github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | Exploit, Vendor Advisory |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:49642 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:56338 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:48126 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/security/cve/CVE-2026-46625 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:36625 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:56357 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:60520 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:48151 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:33183 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:52768 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-06-10T22:01:17.685Z | Reported to Red Hat. |
| ADP | 2026-06-10T21:18:05.372Z | Made public. |
Solutions
ADP: RHSA-2026:48151: Cryostat 4 on RHEL 9
ADP: RHSA-2026:36625: Red Hat Advanced Cluster Security for Kubernetes 4.10
ADP: RHSA-2026:56338: Red Hat Ansible Automation Platform 2.1
ADP: RHSA-2026:56357: Red Hat Ansible Automation Platform 2.2
ADP: RHSA-2026:59153: Red Hat Ansible Automation Platform 2.7
ADP: RHSA-2026:48126: Red Hat Developer Hub 1.10
ADP: RHSA-2026:49642: Red Hat Developer Hub 1.10
ADP: RHSA-2026:52768: Red Hat Developer Hub 1.9
ADP: RHSA-2026:60520: Red Hat OpenShift AI 3.4
ADP: RHSA-2026:33183: Red Hat OpenShift Service Mesh 3.3
Workarounds
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
There are currently no legacy QID mappings associated with this CVE.