{"id":"BIT-etcd-2026-73499","summary":"etcd: Watch API authorization bypass via open-ended range requests","details":"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.","aliases":["CVE-2026-73499","GHSA-xg4h-6gfc-h4m8","GO-2026-6114"],"modified":"2026-08-18T17:25:53.230800452Z","published":"2026-08-18T10:03:47.354Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:etcd:etcd:*:*:*:*:*:go:*:*"]},"references":[{"type":"WEB","url":"https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/releases/tag/v3.5.33"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/releases/tag/v3.6.14"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/releases/tag/v3.7.1"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73499"}],"affected":[{"package":{"name":"etcd","ecosystem":"Bitnami","purl":"pkg:bitnami/etcd"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.5.33"},{"introduced":"3.6.0"},{"fixed":"3.6.14"},{"introduced":"3.7.0"},{"fixed":"3.7.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/etcd/BIT-etcd-2026-73499.json"},"severity":[{"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}