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Vulnerability Details CVE-2026-44726

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 6.6%
CVSS Severity
CVSS v3 Score 7.4
Products affected by CVE-2026-44726
  • Deno » Deno » Version: 2.0.0
    cpe:2.3:a:deno:deno:2.0.0
  • Deno » Deno » Version: 2.0.1
    cpe:2.3:a:deno:deno:2.0.1
  • Deno » Deno » Version: 2.0.2
    cpe:2.3:a:deno:deno:2.0.2
  • Deno » Deno » Version: 2.0.3
    cpe:2.3:a:deno:deno:2.0.3
  • Deno » Deno » Version: 2.0.4
    cpe:2.3:a:deno:deno:2.0.4
  • Deno » Deno » Version: 2.0.5
    cpe:2.3:a:deno:deno:2.0.5
  • Deno » Deno » Version: 2.0.6
    cpe:2.3:a:deno:deno:2.0.6
  • Deno » Deno » Version: 2.1.0
    cpe:2.3:a:deno:deno:2.1.0
  • Deno » Deno » Version: 2.1.1
    cpe:2.3:a:deno:deno:2.1.1
  • Deno » Deno » Version: 2.1.10
    cpe:2.3:a:deno:deno:2.1.10
  • Deno » Deno » Version: 2.1.11
    cpe:2.3:a:deno:deno:2.1.11
  • Deno » Deno » Version: 2.1.12
    cpe:2.3:a:deno:deno:2.1.12
  • Deno » Deno » Version: 2.1.13
    cpe:2.3:a:deno:deno:2.1.13
  • Deno » Deno » Version: 2.1.2
    cpe:2.3:a:deno:deno:2.1.2
  • Deno » Deno » Version: 2.1.3
    cpe:2.3:a:deno:deno:2.1.3
  • Deno » Deno » Version: 2.1.4
    cpe:2.3:a:deno:deno:2.1.4
  • Deno » Deno » Version: 2.1.5
    cpe:2.3:a:deno:deno:2.1.5
  • Deno » Deno » Version: 2.1.6
    cpe:2.3:a:deno:deno:2.1.6
  • Deno » Deno » Version: 2.1.7
    cpe:2.3:a:deno:deno:2.1.7
  • Deno » Deno » Version: 2.1.8
    cpe:2.3:a:deno:deno:2.1.8
  • Deno » Deno » Version: 2.1.9
    cpe:2.3:a:deno:deno:2.1.9
  • Deno » Deno » Version: 2.2.0
    cpe:2.3:a:deno:deno:2.2.0
  • Deno » Deno » Version: 2.2.1
    cpe:2.3:a:deno:deno:2.2.1
  • Deno » Deno » Version: 2.2.10
    cpe:2.3:a:deno:deno:2.2.10
  • Deno » Deno » Version: 2.2.11
    cpe:2.3:a:deno:deno:2.2.11
  • Deno » Deno » Version: 2.2.12
    cpe:2.3:a:deno:deno:2.2.12
  • Deno » Deno » Version: 2.2.13
    cpe:2.3:a:deno:deno:2.2.13
  • Deno » Deno » Version: 2.2.15
    cpe:2.3:a:deno:deno:2.2.15
  • Deno » Deno » Version: 2.2.2
    cpe:2.3:a:deno:deno:2.2.2
  • Deno » Deno » Version: 2.2.3
    cpe:2.3:a:deno:deno:2.2.3
  • Deno » Deno » Version: 2.2.4
    cpe:2.3:a:deno:deno:2.2.4
  • Deno » Deno » Version: 2.2.5
    cpe:2.3:a:deno:deno:2.2.5
  • Deno » Deno » Version: 2.2.6
    cpe:2.3:a:deno:deno:2.2.6
  • Deno » Deno » Version: 2.2.7
    cpe:2.3:a:deno:deno:2.2.7
  • Deno » Deno » Version: 2.2.8
    cpe:2.3:a:deno:deno:2.2.8
  • Deno » Deno » Version: 2.2.9
    cpe:2.3:a:deno:deno:2.2.9
  • Deno » Deno » Version: 2.3.0
    cpe:2.3:a:deno:deno:2.3.0
  • Deno » Deno » Version: 2.3.1
    cpe:2.3:a:deno:deno:2.3.1
  • Deno » Deno » Version: 2.3.2
    cpe:2.3:a:deno:deno:2.3.2
  • Deno » Deno » Version: 2.3.3
    cpe:2.3:a:deno:deno:2.3.3
  • Deno » Deno » Version: 2.3.4
    cpe:2.3:a:deno:deno:2.3.4
  • Deno » Deno » Version: 2.3.5
    cpe:2.3:a:deno:deno:2.3.5
  • Deno » Deno » Version: 2.5.3
    cpe:2.3:a:deno:deno:2.5.3
  • Deno » Deno » Version: 2.5.4
    cpe:2.3:a:deno:deno:2.5.4
  • Deno » Deno » Version: 2.5.5
    cpe:2.3:a:deno:deno:2.5.5
  • Deno » Deno » Version: 2.5.6
    cpe:2.3:a:deno:deno:2.5.6
  • Deno » Deno » Version: 2.5.7
    cpe:2.3:a:deno:deno:2.5.7
  • Deno » Deno » Version: 2.6.0
    cpe:2.3:a:deno:deno:2.6.0
  • Deno » Deno » Version: 2.6.1
    cpe:2.3:a:deno:deno:2.6.1
  • Deno » Deno » Version: 2.6.10
    cpe:2.3:a:deno:deno:2.6.10
  • Deno » Deno » Version: 2.6.2
    cpe:2.3:a:deno:deno:2.6.2
  • Deno » Deno » Version: 2.6.3
    cpe:2.3:a:deno:deno:2.6.3
  • Deno » Deno » Version: 2.6.4
    cpe:2.3:a:deno:deno:2.6.4
  • Deno » Deno » Version: 2.6.5
    cpe:2.3:a:deno:deno:2.6.5
  • Deno » Deno » Version: 2.6.6
    cpe:2.3:a:deno:deno:2.6.6
  • Deno » Deno » Version: 2.6.7
    cpe:2.3:a:deno:deno:2.6.7
  • Deno » Deno » Version: 2.6.8
    cpe:2.3:a:deno:deno:2.6.8
  • Deno » Deno » Version: 2.6.9
    cpe:2.3:a:deno:deno:2.6.9
  • Deno » Deno » Version: 2.7.0
    cpe:2.3:a:deno:deno:2.7.0
  • Deno » Deno » Version: 2.7.1
    cpe:2.3:a:deno:deno:2.7.1
  • Deno » Deno » Version: 2.7.2
    cpe:2.3:a:deno:deno:2.7.2
  • Deno » Deno » Version: 2.7.3
    cpe:2.3:a:deno:deno:2.7.3
  • Deno » Deno » Version: 2.7.4
    cpe:2.3:a:deno:deno:2.7.4
  • Deno » Deno » Version: 2.7.5
    cpe:2.3:a:deno:deno:2.7.5
  • Deno » Deno » Version: 2.7.6
    cpe:2.3:a:deno:deno:2.7.6
  • Deno » Deno » Version: 2.7.7
    cpe:2.3:a:deno:deno:2.7.7


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