CVE-2026-59818: etcd is a distributed key-value store for the data of a distributed system

Routine

MEDIUM 6.5UPGRADE

CVE-2026-59818 is a medium-severity flaw (CVSS 6.5) 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 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-07-08
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 21:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

etcd etcd UPGRADE

Affected: < 3.5.32 · >= 3.6.0 and < 3.6.13

Fixed in: 3.5.32, 3.6.13

Safe to downgrade to: a release before 3.6.0

1. Check installed version

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

2. UPGRADE to 3.5.32 (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 3.6.0 (Debian / Ubuntu)

apt-cache madison etcd sudo apt install etcd=<VERSION_BEFORE_3.6.0> 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_3.6.0> 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-2026-59818?

etcd: upgrade to 3.5.32, 3.6.13. Exact commands for each OS are on this page.

Is CVE-2026-59818 being exploited?

CVE-2026-59818 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-2026-59818 affect?

CVE-2026-59818 affects etcd. Severity is medium (CVSS 6.5). etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl

How urgent is CVE-2026-59818?

Priority 32/100. No elevated risk signals yet.

Software pages

etcd vulnerabilities

References

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