# CVE-2026-73499 — etcd-io etcd

> As of 2026-08-12, CVE-2026-73499 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in etcd-io etcd, CVSS v4.0 7.1. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73499 as of 2026-08-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-12

## What is CVE-2026-73499?

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 record classifies CVE-2026-73499 under weakness class [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 54 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 7.1 — High (derived from 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`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-12

## Is CVE-2026-73499 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **etcd-io**: etcd

## How to fix CVE-2026-73499

No vendor patch reference has been recorded for CVE-2026-73499 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-73499

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73499, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-08-14. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8)

**Other references**

- [github.com](https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41)
- [github.com (7cf71ec9e2ec54230a5454392fa4ffd4574b41ed)](https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed)
- [github.com (afeaa624da19085b47fb5ccc7c22a8c421bc2eae)](https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae)
- [github.com (e863b001bbf3367003a543aa3099db9892134cd7)](https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7)
- [github.com (v3.5)](https://github.com/etcd-io/etcd/releases/tag/v3.5.33)

_Showing 6 of 8 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73499
Full detection coverage and IOCs for threats exploiting CVE-2026-73499 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp