CVE-2026-44726— Deno: TLS retry copies stale upgrade hook, risking plaintext traffic

Deno: TLS retry copies stale upgrade hook, risking plaintext traffic

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

敏感数据的明文传输

denoland deno 加密问题漏洞

denoland deno是denoland公司的一个JavaScript和TypeScript运行时环境。 denoland deno 2.0.0版本至2.7.8之前版本存在加密问题漏洞，该漏洞源于Node.js TLS兼容层缺陷，当autoSelectFamily启用且首次地址族尝试失败时，连接重试后可能导致TLS客户端以明文传输应用数据。

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