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CVE-2026-55517

nvd nist
Published: Jun 23, 2026Modified: Jun 29, 2026

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4.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Exploitability: 2.8 / Impact: 1.4
Source: security-advisories@github.com (Secondary)

Description

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.

Affected (1)

Products: Deno: Deno
Deno
1 product
Deno
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Deno
Before 2.7.5

Related CWEs

CWE-248
Uncaught Exception
An exception is thrown from a function, but it is not caught.

References (1)

Source: security-advisories@github.com
MitigationVendor Advisory

Timeline

No history available yet.