# CVE-2026-125117: Mongoose walks into inherited properties when hydrating, setting, and merging, allowing overwrites of built-in functions (denial of service) and shared schema state Status: published. Published: 2026-11-09. Updated: 2026-11-09. Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.12, 7.8.13, 8.24.7, and 9.11.4, Mongoose can descend into inherited properties while loading database documents in init(), setting dotted paths in $__set, and merging update documents in utils.mergeClone. Attacker-controlled keys such as toString or valueOf can therefore cause Mongoose to write into shared built-in functions instead of an own property. A crafted document, Mixed path, non-strict document or subdocument, findOneAndReplace() replacement, chained update, or Query.prototype.merge() source can overwrite Object.prototype.toString.call, causing later queries on unrelated models to fail until the process restarts. Separately, when an attacker controls the dotted path passed to doc.set(path, value) for a subdocument configured with strict: false, descent through $__set can reach $__schema and alter shared validators or schema options for later documents. Mongoose already blocks __proto__, constructor, and prototype, so this issue overwrites properties on reachable shared objects rather than adding new properties directly to Object.prototype. This issue is fixed in versions 6.13.12, 7.8.13, 8.24.7, and 9.11.4. ## Remediation No remediation reported in collected sources ## Affected products and versions - Automattic / mongoose: < 6.13.12 (affected); >= 7.0.0, < 7.8.13 (affected); >= 8.0.0, < 8.24.7 (affected); >= 9.0.0, < 9.11.4 (affected). Source: CNA: GitHub_M ## Severity and prioritization - CVSS 3.1: 8.2 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H; source: CNA: GitHub_M - CVSS 3.1: 8.2 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H; source: NVD: security-advisories@github.com - CISA KEV: No listing in collected sources - EPSS: Not available - SSVC: Not available - Weaknesses: CWE-1321 ## Exploit evidence No exploit evidence in collected sources. This is not proof of no exploitation. ## References - https://github.com/Automattic/mongoose/security/advisories/GHSA-8332-j7wj-wjw4 (CNA: GitHub_M; x_refsource_CONFIRM) - https://github.com/Automattic/mongoose/commit/18b5513dd463731a2caf0d3395ef1d9eb0735f50 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/2a195d19a4dd240f039a0a226614d5804e8187ee (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/3cb702b8d079c3e267f0b10f41673a1590f703c8 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/85cf897105edfeb5f56be42a18a68704434cac82 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/8cee51beead554df1f3d05645edb439c69eb2a9b (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/8eb74cb4a550cbe0225963b07aebacbd999d4b74 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/releases/tag/6.13.12 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/releases/tag/7.8.13 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/releases/tag/8.24.7 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/releases/tag/9.11.4 (CNA: GitHub_M; x_refsource_MISC) - https://github.com/Automattic/mongoose/commit/18b5513dd463731a2caf0d3395ef1d9eb0735f50 (security-advisories@github.com) - https://github.com/Automattic/mongoose/commit/2a195d19a4dd240f039a0a226614d5804e8187ee (security-advisories@github.com) - https://github.com/Automattic/mongoose/commit/3cb702b8d079c3e267f0b10f41673a1590f703c8 (security-advisories@github.com) - https://github.com/Automattic/mongoose/commit/85cf897105edfeb5f56be42a18a68704434cac82 (security-advisories@github.com) - https://github.com/Automattic/mongoose/commit/8cee51beead554df1f3d05645edb439c69eb2a9b (security-advisories@github.com) - https://github.com/Automattic/mongoose/commit/8eb74cb4a550cbe0225963b07aebacbd999d4b74 (security-advisories@github.com) - https://github.com/Automattic/mongoose/releases/tag/6.13.12 (security-advisories@github.com) - https://github.com/Automattic/mongoose/releases/tag/7.8.13 (security-advisories@github.com) - https://github.com/Automattic/mongoose/releases/tag/8.24.7 (security-advisories@github.com) - https://github.com/Automattic/mongoose/releases/tag/9.11.4 (security-advisories@github.com) - https://github.com/Automattic/mongoose/security/advisories/GHSA-8332-j7wj-wjw4 (security-advisories@github.com) ## Provenance - CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-125117; retrieved 2026-11-09; source updated 2026-11-09 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125117; retrieved 2026-11-10; source updated 2026-11-09 Revision: 13ef849e2757f7c57f5d76d77e32d2ba83866e202cc867a7ffb4bb36bd1f87b7 Canonical: https://y2.dev/cve/CVE-2026-125117 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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