CVE-2026-33413: etcd is a distributed key-value store for the data of a distributed system

Routine

HIGH 8.8UPGRADE

CVE-2026-33413 is a high-severity flaw (CVSS 8.8) affecting etcd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, unauthorized users may bypass authentication or authorization checks and call certain etcd functions in clusters that expose the gRPC API to untrusted or partially trusted clients. In unpatched etcd clusters with etcd auth enabled, unauthorized users are able to call MemberList and learn cluster topology, including member IDs a

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: etcd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 14:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

etcd etcd UPGRADE

Affected: < 3.4.42 · >= 3.5.0 and < 3.5.28 · >= 3.6.0 and < 3.6.9

Fixed in: 3.4.42, 3.5.28, 3.6.9

Safe to downgrade to: a release before 3.5.0

1. Check installed version

apt-cache policy etcd || rpm -q etcd || etcd --version

2. UPGRADE to 3.4.42 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade etcd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade etcd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.5.0 (Debian / Ubuntu)

apt-cache madison etcd sudo apt install etcd=<VERSION_BEFORE_3.5.0> sudo apt-mark hold etcd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list etcd sudo dnf downgrade etcd-<VERSION_BEFORE_3.5.0> sudo dnf versionlock add etcd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33413?

etcd: upgrade to 3.4.42, 3.5.28, 3.6.9. Exact commands for each OS are on this page.

Is CVE-2026-33413 being exploited?

CVE-2026-33413 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33413 affect?

CVE-2026-33413 affects etcd. Severity is high (CVSS 8.8). etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, unauthorized users may bypass authentication or authorization checks and call certain etcd functions in clusters that e

How urgent is CVE-2026-33413?

Priority 35/100. High severity

Software pages

etcd vulnerabilities

Related CVEs

CVE-2026-59818 MEDIUM 6.5 UPGRADE etcd is a distributed key-value store for the data of a distributed system
CVE-2026-44283 NONE 0.0 UPGRADE etcd is a distributed key-value store for the data of a distributed system
CVE-2026-33343 NONE 0.0 UPGRADE etcd is a distributed key-value store for the data of a distributed system

References

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