node-ajv — security advisory
fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.
- Products
- node-ajv
- Affected versions
- 5.0.0-1, 6.10.2-1, 6.12.6-2, 6.12.6-3, 8.12.0~ds+~2.1.1-4, 8.12.0~ds+~2.1.1-5, 8.17.1~ds+~3.0.1+~3.1.0-2, 8.17.1~ds+~3.0.1+~3.1.0-4build1, 8.20.0~ds+~cs6.1.3-1, 8.20.0~ds+~cs7.1.2-1, 8.20.0~ds+~cs7.1.3-1, 8.20.0~ds+~cs7.1.3-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-84394
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.
osv:UBUNTU-CVE-2026-84394
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
Complete source record
{
"id": "cdf4b2d2ad09caf37ae962704227774571df932ef40f50b9fd5fe55d409ca711",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84394",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-84394",
"summary": "fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.",
"evidence": "osv:UBUNTU-CVE-2026-84394",
"products": [
{
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"evidence": "/affected/0/package/name"
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{
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{
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"affected_versions": [
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{
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{
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"evidence": "/affected/3/versions"
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{
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{
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"evidence": "/affected/4/versions"
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{
"value": "8.20.0~ds+~cs7.1.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "8.20.0~ds+~cs7.1.3-1",
"evidence": "/affected/4/versions"
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{
"value": "8.20.0~ds+~cs7.1.3-3",
"evidence": "/affected/4/versions"
}
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{
"name": {
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"evidence": "/affected/5/package/name"
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"fixed_versions": [],
"affected_versions": [
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-84394",
"aliases": [
"UBUNTU-CVE-2026-84394"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-ajv",
"purl": "pkg:deb/ubuntu/node-ajv?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"
},
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"package": {
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"purl": "pkg:deb/ubuntu/node-ajv?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"6.10.2-1"
],
"database_specific": {
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],
"package": {
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"purl": "pkg:deb/ubuntu/node-ajv?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"6.12.6-2",
"6.12.6-3"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
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"8.20.0~ds+~cs7.1.3-3"
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"8.17.1~ds+~3.0.1+~3.1.0-2",
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
"binary_name": "node-ajv",
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}
],
"modified": "2026-10-17T13:01:12.701574343Z",
"provider": "osv",
"upstream": [
"CVE-2026-84394"
],
"references": [
"https://ubuntu.com/security/CVE-2026-84394",
"https://www.cve.org/CVERecord?id=CVE-2026-84394",
"https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g",
"https://cna.openjsf.org/security-advisories.html"
]
},
"related_cves": [
{
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361246,
"published_at": "2026-09-03T05:16:00+00:00"
}