High
Security advisory
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the uniqueItems keyword validation uses an O(n²) pairwise comparison loop with no short-circuit or size limit. A remote unauthenticated attacker can submit a moderately-sized JSON array that consumes disproportionate CPU time, leading to denial of service. The impacted component is io.vertx:vertx-json-schema. The following Vert.x modules depend on vertx-json-schema and are also affected: io.vertx:vertx-web-openapi-router io.vertx:vertx-web-validation io.vertx:vertx-openapi
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102461
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:01 UTC · Revision 1
Source evidence
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the uniqueItems keyword validation uses an O(n²) pairwise comparison loop with no short-circuit or size limit. A remote unauthenticated attacker can submit a moderately-sized JSON array that consumes disproportionate CPU time, leading to denial of service. The impacted component is io.vertx:vertx-json-schema. The following Vert.x modules depend on vertx-json-schema and are also affected: io.vertx:vertx-web-openapi-router io.vertx:vertx-web-validation io.vertx:vertx-openapi
osv:CVE-2026-102461
Complete source record
{
"id": "76459008f69ebad3101052888598676fde078d2a30db2e47719459c154beac08",
"url": "https://osv.dev/vulnerability/CVE-2026-102461",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-102461",
"summary": "In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the uniqueItems keyword validation uses an O(n²) pairwise comparison loop with no short-circuit or size limit. A remote unauthenticated attacker can submit a moderately-sized JSON array that consumes disproportionate CPU time, leading to denial of service. The impacted component is io.vertx:vertx-json-schema. The following Vert.x modules depend on vertx-json-schema and are also affected: io.vertx:vertx-web-openapi-router io.vertx:vertx-web-validation io.vertx:vertx-openapi",
"evidence": "osv:CVE-2026-102461",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-102461",
"aliases": [
"CVE-2026-102461",
"GHSA-4m87-8qfr-8p8m"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/eclipse-vertx/vert.x",
"type": "GIT",
"events": [
{
"introduced": "c343c7876fb7e78e6cd616fe1e0b86693de7c1a3"
},
{
"fixed": "a1a2c0971108288b55c0888610f82069be2af00f"
},
{
"introduced": "6feb3f329729d6c78f6544b542b1668a3e9f6704"
},
{
"fixed": "83dfa248747eb5bd5b8bacc7eec3b018fe8bb156"
},
{
"introduced": "a38832fbdabfa2fdb418988b9cc36831765a2ecd"
},
{
"last_affected": "a38832fbdabfa2fdb418988b9cc36831765a2ecd"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.5.0"
},
{
"fixed": "4.5.35"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.0.0"
},
{
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}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*",
"range": [
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},
{
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}
],
"source": "CPE_STRING"
}
]
}
},
{
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"type": "GIT",
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{
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{
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},
{
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{
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},
{
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},
{
"last_affected": "51656be5a0d9b854b0baf7e9cef54a78711e16cf"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "4.0.0"
},
{
"last_affected": "4.5.34"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
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},
{
"last_affected": "5.0.12"
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],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
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"introduced": "5.1.0"
},
{
"last_affected": "5.1.9"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
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{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
}
},
{
"repo": "https://github.com/eclipse-vertx/vertx-sql-client",
"type": "GIT",
"events": [
{
"introduced": "f08d97e8e9a8ab5bbbc9e9f817edb99214d6b72e"
},
{
"fixed": "6b82c7eb66c5c6be65bec49c2ba6bcc4d2bc7254"
},
{
"introduced": "6837af793026a2fba5b6b32e0161fce6d9c8b691"
},
{
"fixed": "2427bef93e286ee0621875aa398c09ca5eedbfbd"
},
{
"introduced": "3708bdc1d328afce37abd39dba932399a0469742"
},
{
"last_affected": "3708bdc1d328afce37abd39dba932399a0469742"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.5.0"
},
{
"fixed": "4.5.35"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.0.0"
},
{
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}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.2.0"
},
{
"last_affected": "5.2.0"
}
],
"source": "CPE_STRING"
}
]
}
},
{
"repo": "https://github.com/vert-x3/vertx-web",
"type": "GIT",
"events": [
{
"introduced": "bdaa091562e35878cd5780930f49c708b888b58a"
},
{
"fixed": "450fb5221bcca4f9ef8acbf8aefaad0331e85472"
},
{
"introduced": "a62720242d2f515969aa34dd185d870b846be5e1"
},
{
"fixed": "94c4294a0949675645472076cc452502d42f7586"
},
{
"introduced": "ff8e680573776ca8da999fb6c0ccc6318d5eaad0"
},
{
"last_affected": "ff8e680573776ca8da999fb6c0ccc6318d5eaad0"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.5.0"
},
{
"fixed": "4.5.35"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
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},
{
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}
],
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},
{
"cpe": "cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*",
"range": [
{
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},
{
"last_affected": "5.2.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
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"4.5.34",
"5.1.8",
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"4.5.32",
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"4.4.0",
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"4.3.4",
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"4.1.0.Beta1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102461.json"
}
}
],
"modified": "2026-10-28T02:30:26.869185623Z",
"provider": "osv",
"references": [
"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/340",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102461.json",
"https://github.com/eclipse-vertx/vertx-json-schema/security/advisories/GHSA-4m87-8qfr-8p8m",
"https://nvd.nist.gov/vuln/detail/CVE-2026-102461"
],
"provider_metadata": {
"cna_assigner": "eclipse",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102461.json"
}
},
"related_cves": [
{
"value": "CVE-2026-102461",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493538,
"published_at": "2026-10-15T08:23:54.256+00:00"
}