High
node-ajv — security advisory
fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.
- 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-2026-18446
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:55 UTC · Revision 1
Source evidence
fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.
osv:UBUNTU-CVE-2026-18446
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": "afd892be746322feeb94afef016e5ce88aa63a231a2843471544c921ff87aa6d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18446",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-18446",
"summary": "fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.",
"evidence": "osv:UBUNTU-CVE-2026-18446",
"products": [
{
"name": {
"value": "node-ajv",
"evidence": "/affected/0/package/name"
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"value": "5.0.0-1",
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
"name": {
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"evidence": "/affected/5/package/name"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-18446",
"aliases": [
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],
"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": [
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"ranges": [
{
"type": "ECOSYSTEM",
"events": [
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]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/node-ajv?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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],
"database_specific": {
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"package": {
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"ecosystem": "Ubuntu:20.04:LTS"
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"versions": [
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"purl": "pkg:deb/ubuntu/node-ajv?arch=source&distro=jammy",
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},
"versions": [
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"database_specific": {
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},
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],
"modified": "2026-10-17T12:59:53.726913937Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-18446",
"https://www.cve.org/CVERecord?id=CVE-2026-18446",
"https://github.com/fastify/fast-uri/security/advisories/GHSA-7p8r-x3mc-p8w7",
"https://cna.openjsf.org/security-advisories.html"
]
},
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359888,
"published_at": "2026-07-31T15:16:00+00:00"
}