{"affected":[{"defaultStatus":"unaffected","product":"node","source":"CNA: openjs","vendor":"nodejs","versions":[{"lessThan":"22.23.5","status":"affected","version":"0.0.0","versionType":"semver"},{"lessThan":"24.22.3","status":"affected","version":"23.0.0","versionType":"semver"},{"lessThan":"26.13.1","status":"affected","version":"25.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-123864","cwes":["CWE-416"],"description":"A re-entrancy flaw in Node.js HTTPS lets an unauthenticated client read memory belonging to other connections, including TLS private keys and other users' requests. TLSWrap::DoWrite() calls ClearOut() directly when asked to write zero bytes; if that write is issued from JavaScript running inside the HTTP parser's on_body callback, ClearOut() decrypts the next TLS record while the parser is still mid-body, re-entering llhttp_execute() and causing a use-after-free and an out-of-bounds heap read. The server then copies that freed or unrelated heap memory into the response for the request body. Triggering it requires a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk, and reading the leaked memory requires any ordinary route that echoes or stores a request body. Cleartext node:http is not affected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.1,"severity":"high","source":"CNA: openjs","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H","version":"3.0"}],"modifiedAt":1794421076773,"publishedAt":1794421076773,"references":[{"source":"CNA: openjs","tags":["vendor-advisory"],"url":"https://nodejs.org/en/blog/vulnerability/november-2026-security-releases"},{"source":"CNA: openjs","tags":[],"url":"https://cna.openjsf.org/security-advisories.html"}],"remediation":[],"revision":"043a67222dbe9ada74c6a04be271229a3449049ea0cf86f2f60eb0f9a73b0ef6","sources":[{"modifiedAt":1794421076773,"name":"CNA: openjs","retrievedAt":1794424110234,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123864"}],"ssvc":null,"status":"published","title":"Node.js is vulnerable to cross-connection memory disclosure via TLS write re-entrancy in the HTTPS request parser","updatedAt":1794424110234}