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CVE-2026-55517
MEDIUM(4.3)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Risk Signal Score16/100 — NIEDRIG
- CVSS 4.3 — Mittel
EPSS-Score
0%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
4.3
Technische Schwere
Beschreibung
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.5, a Deno program that opens a client WebSocket connection could be crashed by the remote server. While handling the WebSocket handshake response, Deno parsed the Sec-WebSocket-Protocol and Sec-WebSocket-Extensions response headers in a way that assumed their bytes were always printable ASCII. A response header containing non-visible-ASCII bytes (0x80-0xFF) caused a panic that aborted the entire Deno process. This vulnerability is fixed in 2.7.5.
GitHub Advisories
GHSA-x2qc-cmh9-f4hfMEDIUM
Deno: Denial of service via non-ASCII bytes in WebSocket response headers
rust/deno→ 2.7.5
GitHub Advisory