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CVE-2026-73499— etcd: Watch API authorization bypass via open-ended range requests

Quick assessment

Affected
etcd-io etcd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

etcd-io etcd是etcd-io团队的一款分布式键值存储系统。 etcd-io etcd 3.5.33之前版本、3.6.0至3.6.14之前版本和3.7.0-alpha.0至3.7.1之前版本存在授权问题漏洞，该漏洞源于RBAC权限检查前重写RangeEnd哨兵，可能导致拥有单个键读权限的用户通过Watch gRPC API获取字典序更大的所有键的watch事件。

CVSS 7.1 · High EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
etcd-io etcd < 3.5.33 affected
>= 3.6.0, < 3.6.14 affected
>= 3.7.0-alpha.0, < 3.7.1 affected
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I. Basic Information for CVE-2026-73499

Vulnerability Information
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Vulnerability Title
etcd: Watch API authorization bypass via open-ended range requests
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
etcd-io etcd 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
etcd-io etcd是etcd-io团队的一款分布式键值存储系统。 etcd-io etcd 3.5.33之前版本、3.6.0至3.6.14之前版本和3.7.0-alpha.0至3.7.1之前版本存在授权问题漏洞，该漏洞源于RBAC权限检查前重写RangeEnd哨兵，可能导致拥有单个键读权限的用户通过Watch gRPC API获取字典序更大的所有键的watch事件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
etcd-io etcd < 3.5.33 -

II. Public POCs for CVE-2026-73499

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9785 chars
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III. Intelligence Information for CVE-2026-73499

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Patches & Fixes for CVE-2026-73499 (4)

Vendor Advisories for CVE-2026-73499 (1)

Vendor Pages for CVE-2026-73499 (1)

IV. Related Vulnerabilities

Same product: etcd
Same vendor: etcd-io
Same weakness: CWE-863

V. Comments for CVE-2026-73499

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