{"id":"CVE-2026-104852","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-104852","generatedAt":"2026-10-28T00:59:26.006Z","title":"GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas.","description":"GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to 12.0.1, the GraphQL Tools utils package's mergeDeep function follows inherited properties while recursively merging source objects and does not exclude __proto__, constructor, or prototype keys. An unauthenticated GraphQL client can alias fields to those names so responses from two subgraphs collide during ordinary supergraph result merging, causing mergeDeep to traverse Object and Function prototypes and overwrite Function.prototype.call with a subgraph-supplied value. This breaks subsequent requests in the process until restart. This issue is fixed in version 12.0.1.","published":"2026-10-05T23:17:00.000Z","lastModified":"2026-10-06T15:17:13.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.2,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1321"],"affected":[],"epss":{"score":0.00356,"percentile":0.29055,"date":"2026-10-26","history":[{"date":"2026-10-06","score":0.00356,"percentile":0.27143}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-05T23:17:00.000Z","detail":{"score":"8.2","severity":"HIGH","publishedAt":"2026-10-05T23:17:00.213Z"},"summary":"New CVE, high severity (CVSS 8.2)."}],"references":[{"url":"https://github.com/ardatan/graphql-tools/commit/0b9529f1988fd36186a7c106a6efe0356f1b7f2e","source":"security-advisories@github.com"},{"url":"https://github.com/ardatan/graphql-tools/pull/8423","source":"security-advisories@github.com"},{"url":"https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/utils@12.0.1","source":"security-advisories@github.com"},{"url":"https://github.com/ardatan/graphql-tools/security/advisories/GHSA-7mx3-vvmw-hjmv","source":"security-advisories@github.com"},{"url":"https://github.com/graphql-hive/gateway/pull/2600","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-104852","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}