--- id: CVE-2026-46625 title: 'JavaScript Cookie is a JavaScript API for handling cookies, client-side' summary: >- 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, t… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N' cwe: - CWE-1321 - CWE-915 vendor: js-cookie product: javascript_cookie affected: - javascript_cookie < 3.0.7 - 3scale_api_management = 2.0 - ansible_automation_platform = 2.0 - openshift_ai - openshift_lightspeed - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux = 10.0 patched: - javascript_cookie 3.0.7 published: '2026-06-10' updated: '2026-09-09' sourceUpdated: '2026-09-09T13:20:18.357' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46625' references: - url: >- https://github.com/js-cookie/js-cookie/commit/eb3c40e89731e99b8970faaf35ddad249c6c0020 label: security-advisories@github.com - url: 'https://github.com/js-cookie/js-cookie/releases/tag/v3.0.7' label: security-advisories@github.com - url: >- https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j label: security-advisories@github.com - url: 'https://access.redhat.com/errata/RHSA-2026:33183' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36625' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:48126' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:48151' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:49642' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:52768' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:56338' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:56357' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:59153' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:60520' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-46625' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2487740' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46625.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-46625' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46625' - url: 'https://access.redhat.com/errata/RHSA-2026:84734' tags: - nvd - cve.org - exploit-available - csaf - vex - red-hat exploitAvailable: true ssvc: exploitation: poc automatable: 'yes' technicalImpact: partial timestamp: '2026-06-11T14:46:15.083511Z' epss: 0.00919 epssPercentile: 0.60079 ingestedAt: '2026-08-29T00:27:53.248Z' --- ## Overview 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. ## Affected - `javascript_cookie < 3.0.7` - `3scale_api_management = 2.0` - `ansible_automation_platform = 2.0` - `openshift_ai` - `openshift_lightspeed` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux = 10.0` ## Remediation Upgrade past the affected range: - `javascript_cookie 3.0.7` ## Vendor advisories - **RHSA-2026:48151** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48151) - **RHSA-2026:36625** · Red Hat · fixed in: Red Hat Advanced Cluster Security for Kubernetes 4.10 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36625) - **RHSA-2026:56338** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.1 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:56338) - **RHSA-2026:56357** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:56357) - **RHSA-2026:59153** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.7 · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:59153) - **RHSA-2026:48126** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48126) - **RHSA-2026:49642** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-08-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:49642) - **RHSA-2026:52768** · Red Hat · fixed in: Red Hat Developer Hub 1.9 · released 2026-08-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:52768) - **RHSA-2026:60520** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60520) - **RHSA-2026:33183** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.3 · released 2026-06-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:33183) - **Red Hat VEX** · Important · affected: OpenShift Lightspeed, Red Hat 3scale API Management Platform 2, Red Hat Ansible Automation Platform 2, Red Hat JBoss Enterprise Application Platform 7 · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat JBoss Enterprise Application Platform 7, OpenShift Lightspeed, Red Hat 3scale API Management Platform 2 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46625.json) - **RHSA-2026:84734** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84734)