{"id":"CVE-2026-44726","revision":"6e9518a283a949fea769ea05d491a989","records":[{"revision":"6e9518a283a949fea769ea05d491a989","observedAt":"2026-10-25T10:17:27.754+00:00","statement":{"source":"nvd","id":"CVE-2026-44726","aliases":[],"title":"Deno is a JavaScript, TypeScript, and WebAssembly runtime. From 2.0.0 until 2.7.8, a flaw in Deno's Node.js tls compatibility layer could cause a TLS client to transmit application data in plaintext after a connection retry. When `autoSelec…","description":"Deno is a JavaScript, TypeScript, and WebAssembly runtime. From 2.0.0 until 2.7.8, a flaw in Deno's Node.js tls compatibility layer could cause a TLS client to transmit application data in plaintext after a connection retry. When `autoSelectFamily was enabled and the first address-family attempt failed, the socket reinitialization path reused a stale TLS upgrade hook that was bound to the original, failed handle. As a result, the replacement TCP connection was never upgraded to TLS, and any data the application wrote before the secureConnect event travelled over the network unencrypted. A network attacker positioned to cause the initial connection attempt to fail (for example, by dropping IPv6 traffic on a dual-stack host) could deterministically trigger the fallback path and observe or tamper with traffic that the application believed was TLS-protected. This vulnerability is fixed in 2.7.8.","state":0,"publishedAt":"2026-06-23T18:17:48.623+00:00","modifiedAt":"2026-06-26T18:11:01.95+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/denoland/deno/security/advisories/GHSA-chqv-56wv-7564"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44726","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-319"],"productCriteria":["cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-06-23T18:17:48.623","lastModified":"2026-06-26T18:11:01.950"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-44726","identifiers":["CVE-2026-44726"]},"retained":false,"historicalAffected":[]}],"coverage":[]}