{"id":"CVE-2026-104849","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-104849","generatedAt":"2026-10-27T23:56:58.014Z","title":"An attacker who can first pollute the prototype can cause the worker pool to load attacker-selected JavaScript and can read or modify task data with the host process's privileges.","description":"Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.2, Tinypool reads filename from a caller-supplied options object in pool.run(task, options) without requiring an own property, so a polluted Object.prototype.filename can replace the intended worker module. Applications are affected only when they pass their own second-argument options object to pool.run(); calls without that argument use the trusted default options object. An attacker who can first pollute the prototype can cause the worker pool to load attacker-selected JavaScript and can read or modify task data with the host process's privileges. This issue is fixed in version 2.1.2.","published":"2026-10-02T17:17:04.000Z","lastModified":"2026-10-06T17:17:16.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":9.5,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-94","CWE-1321"],"affected":[],"epss":{"score":0.00485,"percentile":0.41488,"date":"2026-10-26","history":[{"date":"2026-10-03","score":0.0039,"percentile":0.30714}]},"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 (0.48%). 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":"2026-10-02T17:17:04.000Z","detail":{"score":"9.5","severity":"CRITICAL","publishedAt":"2026-10-02T17:17:03.623Z"},"summary":"New CVE, critical severity (CVSS 9.5)."}],"references":[{"url":"https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf","source":"security-advisories@github.com"},{"url":"https://github.com/tinylibs/tinypool/pull/135","source":"security-advisories@github.com"},{"url":"https://github.com/tinylibs/tinypool/releases/tag/v2.1.2","source":"security-advisories@github.com"},{"url":"https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr","source":"security-advisories@github.com"},{"url":"https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-104849","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."}