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], a gRPC endpoint does have a configurable per message maximum size in bytes, however the maximum size applies to the received bytes. When applied to a compressed message, this only applies to the compressed size and not the actual size of the uncompressed content. This can be used to force a gRPC endpoint to allocate more bytes than the value defined by the configuration, making the endpoint vulnerable to compression bomb attacks. The impacted component is io.vertx:vertx-gprc-server.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102477
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 01:43 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], a gRPC endpoint does have a configurable per message maximum size in bytes, however the maximum size applies to the received bytes. When applied to a compressed message, this only applies to the compressed size and not the actual size of the uncompressed content. This can be used to force a gRPC endpoint to allocate more bytes than the value defined by the configuration, making the endpoint vulnerable to compression bomb attacks. The impacted component is io.vertx:vertx-gprc-server.
osv:CVE-2026-102477
Complete source record
{
"id": "fd392f1f45fdd804d8064925bea8ee2c58511929897cc297dfbfa7912c25a890",
"url": "https://osv.dev/vulnerability/CVE-2026-102477",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-102477",
"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], a gRPC endpoint does have a configurable per message maximum size in bytes, however the maximum size applies to the received bytes. When applied to a compressed message, this only applies to the compressed size and not the actual size of the uncompressed content. This can be used to force a gRPC endpoint to allocate more bytes than the value defined by the configuration, making the endpoint vulnerable to compression bomb attacks. The impacted component is io.vertx:vertx-gprc-server.",
"evidence": "osv:CVE-2026-102477",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-102477",
"aliases": [
"CVE-2026-102477",
"GHSA-4wvq-75mw-q6cg"
],
"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": [
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"repo": "https://github.com/eclipse-vertx/vert.x",
"type": "GIT",
"events": [
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{
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{
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{
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],
"database_specific": {
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{
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"source": "CPE_RANGE"
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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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{
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"source": "CPE_STRING"
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}
},
{
"repo": "https://github.com/eclipse-vertx/vertx-grpc",
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{
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{
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{
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],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "4.0.0"
},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
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},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
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},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
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{
"range": [
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"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
}
},
{
"repo": "https://github.com/eclipse-vertx/vertx-sql-client",
"type": "GIT",
"events": [
{
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},
{
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},
{
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},
{
"fixed": "3708bdc1d328afce37abd39dba932399a0469742"
},
{
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{
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}
],
"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"
}
]
}
},
{
"repo": "https://github.com/vert-x3/vertx-web",
"type": "GIT",
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{
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{
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}
],
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{
"cpe": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*",
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{
"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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}
}
],
"versions": [
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"4.5.34",
"4.5.33",
"4.5.32",
"4.5.31",
"4.5.30",
"4.5.29",
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"4.5.12",
"4.5.11",
"4.5.10",
"4.5.9",
"4.5.8",
"4.5.7",
"4.5.6",
"4.5.5",
"4.5.4",
"4.5.3",
"4.5.2",
"4.5.1",
"4.5.0",
"5.0.12",
"5.0.11",
"5.0.10",
"5.0.9",
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"5.0.7",
"5.0.6",
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"5.0.4",
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"4.4.5",
"4.4.4",
"4.4.3",
"4.4.2",
"4.4.1",
"4.4.0",
"4.3.5",
"4.3.4",
"4.3.3",
"4.3.2",
"4.3.1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102477.json"
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}
],
"modified": "2026-10-28T02:30:48.586745781Z",
"provider": "osv",
"references": [
"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/349",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102477.json",
"https://github.com/eclipse-vertx/vertx-grpc/security/advisories/GHSA-4wvq-75mw-q6cg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-102477"
],
"provider_metadata": {
"cna_assigner": "eclipse",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102477.json"
}
},
"related_cves": [
{
"value": "CVE-2026-102477",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517077,
"published_at": "2026-10-15T08:28:25.876+00:00"
}