CVE-2026-59818: etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation

mediumCVSS 6.5CVE-2026-59818

CSIRTS triage

vendor: etcd product: etcdOther

What: A vulnerability in the gRPC client listener does not enforce certificate revocation.
Who is affected: Deployments of etcd are affected.
Urgency: Remediation is important due to the medium severity of potential security risks.
Action: Update to the latest version of etcd to mitigate this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59818

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-598180.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59818	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for etcd

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] etcd: Vulnerability allows bypassing security measurescert-bund · 2026-07-09
mediumCVE-2026-59818: etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 an…nvd · 2026-07-08