CVE-2026-73499Moderate

etcd: Watch API authorization bypass via open-ended range requests

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: Not published
Impact: Not stated
EPSS, next 30 days: Not scored yet
Public exploit code: No Nuclei template lists it
Exploitability: Not assessed
Publicly disclosed: No
Customer action: Required: apply the update
Component: Mariner
Weakness: CWE-863: Incorrect Authorization
Issued by: GitHub_M
Published: 23 Aug 2026 · August 2026
Last revised: 23 Aug 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

2 affected products

azl3 flannel 0.24.2-29 on Azure Linux 3.0
azl3 kubernetes 1.30.10-27 on Azure Linux 3.0

What changed

First observed 14 Oct 2026

23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete

Show 2 more recent changes

18 Oct 2026 · 14:54:30 UTCLink: August 2026 → /security?release=2026-Aug#cves
14 Oct 2026 · 11:22:42 UTCSource coverage: msrc-cvrf Incomplete → Current

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

Explore global source statements, affected packages and advisory history for CVE-2026-73499. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-73499

Published

etcd

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "etcd-io",
                    "product": "etcd",
                    "versions": [
                        {
                            "version": "< 3.5.33",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.6.0, < 3.6.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.7.0-alpha.0, < 3.7.1",
                            "status": "affected"
                        }
                    ]
                }

nvd · CVE-2026-73499

Published

No affected-package array is stated in this source revision. Check its state and earlier observations; this does not establish that every package is unaffected.

osv · GHSA-xg4h-6gfc-h4m8

Published

go.etcd.io/etcd/v3

SEMVER · introduced 3.7.0-alpha.0 → fixed 3.7.1

go.etcd.io/etcd/v3

SEMVER · introduced 3.6.0 → fixed 3.6.14

go.etcd.io/etcd/v3

SEMVER · introduced 0 → fixed 3.5.33

osv · GO-2026-6114

Published

go.etcd.io/etcd/server/v3

SEMVER · introduced 0 → fixed 3.5.33 → introduced 3.6.0 → fixed 3.6.14 → introduced 3.7.0-alpha.0 → fixed 3.7.1