High
etcd: Watch API authorization bypass via open-ended range requests
Type: advisorySources: OSV
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-73499
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 10:23 UTC · Revision 1
Source evidence
etcd: Watch API authorization bypass via open-ended range requests
core-osv · Original sourcePublished 12 Aug 2026, 21:20 UTC
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.
osv:CVE-2026-73499
Complete source record
{
"id": "4ddbb5576353e213676931c2ecb0bfaf4a256d6f2e76d86cb23f2b9c2a85e79c",
"url": "https://osv.dev/vulnerability/CVE-2026-73499",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "etcd: Watch API authorization bypass via open-ended range requests",
"summary": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.",
"evidence": "osv:CVE-2026-73499",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-73499",
"aliases": [
"BIT-etcd-2026-73499",
"CVE-2026-73499",
"GHSA-xg4h-6gfc-h4m8",
"GO-2026-6114"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/etcd-io/etcd",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "9f4b125405c7fbd92e2c9cbb5235feffe1904a1d"
},
{
"introduced": "f5d605a93abe2fdfa13880aab0f1f3a4203628dd"
},
{
"fixed": "fc04cf702b0a46c2fd85547a2be05705b100a496"
},
{
"introduced": "f19aca68580f74f27ed371d0e09e9ef6b1b2b93d"
},
{
"fixed": "5e7fd0de9a57db03ecc11794dc40403a734c07bb"
},
{
"fixed": "6643f80602461a6095c9b294b6512fd9719bef41"
},
{
"fixed": "7cf71ec9e2ec54230a5454392fa4ffd4574b41ed"
},
{
"fixed": "afeaa624da19085b47fb5ccc7c22a8c421bc2eae"
},
{
"fixed": "e863b001bbf3367003a543aa3099db9892134cd7"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.5.33"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "3.6.0"
},
{
"fixed": "3.6.14"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
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{
"fixed": "3.7.1"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "6643f80602461a6095c9b294b6512fd9719bef41"
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"source": "REFERENCES_COMMIT"
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"source": "REFERENCES_COMMIT"
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"source": "REFERENCES_COMMIT"
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{
"range": [
{
"fixed": "9f4b125405c7fbd92e2c9cbb5235feffe1904a1d"
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],
"source": "REFERENCES_TAG",
"original_tag": "v3.5.33"
},
{
"range": [
{
"fixed": "fc04cf702b0a46c2fd85547a2be05705b100a496"
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"source": "REFERENCES_TAG",
"original_tag": "v3.6.14"
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}
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73499.json"
}
}
],
"modified": "2026-10-28T02:30:27.752838110Z",
"provider": "osv",
"references": [
"https://github.com/etcd-io/etcd/releases/tag/v3.5.33",
"https://github.com/etcd-io/etcd/releases/tag/v3.6.14",
"https://github.com/etcd-io/etcd/releases/tag/v3.7.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73499.json",
"https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-73499",
"https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41",
"https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed",
"https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae",
"https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7"
],
"provider_metadata": {
"cwe_ids": [
"CWE-863"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73499.json"
}
},
"related_cves": [
{
"value": "CVE-2026-73499",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 494464,
"published_at": "2026-08-12T21:20:31.888+00:00"
}