CVE-2026-73499: Etcd-Io Etcd

High severity, CVSS 7.1. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Etcd-Io Etcd: before 3.5.33 (fixed in 3.5.33); from 3.6.0, before 3.6.14 (fixed in 3.6.14); from 3.7.0-alpha.0, before 3.7.1 (fixed in 3.7.1)

Published 2026-08-12. Last modified 2026-09-18.