Skip to content

CVE-2026-55517

is CVE-2026-55517real, exploitable, or a false positive? Here's the community verdict.

☆ Watch
Medium · CVSS 4.3CWE-248

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

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.

References

NVD MITRE CVE.org

Published

Embed this verdict
TruePositive verdict for CVE-2026-55517
Markdown
[![TruePositive verdict](https://www.truepositive.app/cve/CVE-2026-55517/badge.svg)](https://www.truepositive.app/cve/CVE-2026-55517)
HTML
<a href="https://www.truepositive.app/cve/CVE-2026-55517"><img src="https://www.truepositive.app/cve/CVE-2026-55517/badge.svg" alt="TruePositive verdict for CVE-2026-55517"></a>

Live badge that updates automatically as the community verdict changes.

Community ground truth

In your experience, is this finding real and exploitable?

0 verdicts
Not a real issue

No account needed. Anonymous verdicts post as an unverified signal. Log in to make yours verified and earn reputation.

Field notes & remediation

Verdicts are the quick signal. Notes are the evidence and fixes behind them.

No notes yet. Be the first to share what you saw, or a fix that worked.

    Add a field note or remediationoptional
    Note type

    What are you adding?

    Markdown supported · minimum 20 characters.

    Related CVEs

    Same weakness: CWE-248.