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vuln-cve/data/2026/55xxx/CVE-2026-55517.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-55517",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-06-16T22:44:22.284Z",
"datePublished": "2026-06-23T17:24:59.498Z",
"dateUpdated": "2026-06-23T17:52:56.960Z"
},
"containers": {
"cna": {
"title": "Deno: Denial of service via non-ASCII bytes in WebSocket response headers",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-248",
"lang": "en",
"description": "CWE-248: Uncaught Exception",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"references": [
{
"name": "https://github.com/denoland/deno/security/advisories/GHSA-x2qc-cmh9-f4hf",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/denoland/deno/security/advisories/GHSA-x2qc-cmh9-f4hf"
}
],
"affected": [
{
"vendor": "denoland",
"product": "deno",
"versions": [
{
"version": "< 2.7.5",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-06-23T17:24:59.498Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"source": {
"advisory": "GHSA-x2qc-cmh9-f4hf",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-23T17:52:15.311461Z",
"id": "CVE-2026-55517",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-06-23T17:52:56.960Z"
}
}
]
}
}