etcd-io etcd up to 3.5.32/3.6.13/3.7.0 Range Permission Cache range_perm_cache.go isRangeOpPermitted permission

Summaryinfo

A vulnerability was found in etcd-io etcd up to 3.5.32/3.6.13/3.7.0 and classified as problematic. Affected by this issue is the function isRangeOpPermitted of the file server/auth/range_perm_cache.go of the component Range Permission Cache. Executing a manipulation can lead to permission. This vulnerability is tracked as CVE-2026-73499. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in etcd-io etcd up to 3.5.32/3.6.13/3.7.0. It has been declared as problematic. This vulnerability affects the function isRangeOpPermitted of the file server/auth/range_perm_cache.go of the component Range Permission Cache. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-73499 since 08/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

Upgrading to version 3.5.33, 3.6.14 or 3.7.1 eliminates this vulnerability.

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Productinfo

Vendor

• etcd-io

Name

• etcd

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8
• 3.5.9
• 3.5.10
• 3.5.11
• 3.5.12
• 3.5.13
• 3.5.14
• 3.5.15
• 3.5.16
• 3.5.17
• 3.5.18
• 3.5.19
• 3.5.20
• 3.5.21
• 3.5.22
• 3.5.23
• 3.5.24
• 3.5.25
• 3.5.26
• 3.5.27
• 3.5.28
• 3.5.29
• 3.5.30
• 3.5.31
• 3.5.32
• 3.6
• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 3.6.12
• 3.6.13
• 3.7.0

Website

• Product: https://github.com/etcd-io/etcd/

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