UBUNTU-CVE-2026-59818
A vulnerability in etcd prior to versions 3.5.32 and 3.6.13 allows clients with revoked certificates to authenticate successfully over gRPC when etcd is configured to split HTTP and gRPC client endpoints and uses a client Certificate Revocation List (CRL). This occurs because the CRL is not enforced on the gRPC listener, potentially allowing unauthorized access. The issue is fixed in versions 3.5.32 and 3.6.13.
AI Analysis
Technical Summary
etcd, a distributed key-value store, has a security flaw in versions before 3.5.32 and 3.6.13 where the --client-crl-file option, intended to revoke client certificates, is not enforced on the gRPC listener when HTTP and gRPC client endpoints are split using --listen-client-http-urls. This allows clients with revoked certificates to authenticate successfully over gRPC. The vulnerability is resolved in versions 3.5.32 and 3.6.13.
Potential Impact
Clients with revoked certificates can still authenticate over the gRPC listener, potentially allowing unauthorized access to etcd services. The vulnerability affects confidentiality and integrity but does not impact availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade affected etcd versions to 3.5.32 or 3.6.13 or later, where the issue is fixed. No alternative mitigations are indicated. Patch status is confirmed fixed in these versions.
UBUNTU-CVE-2026-59818
Description
A vulnerability in etcd prior to versions 3.5.32 and 3.6.13 allows clients with revoked certificates to authenticate successfully over gRPC when etcd is configured to split HTTP and gRPC client endpoints and uses a client Certificate Revocation List (CRL). This occurs because the CRL is not enforced on the gRPC listener, potentially allowing unauthorized access. The issue is fixed in versions 3.5.32 and 3.6.13.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu0.1+esm2?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/[email protected]+dfsg-6ubuntu0.2+esm1?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/[email protected]+dfsg-7ubuntu0.22.04.2+esm3?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
etcd, a distributed key-value store, has a security flaw in versions before 3.5.32 and 3.6.13 where the --client-crl-file option, intended to revoke client certificates, is not enforced on the gRPC listener when HTTP and gRPC client endpoints are split using --listen-client-http-urls. This allows clients with revoked certificates to authenticate successfully over gRPC. The vulnerability is resolved in versions 3.5.32 and 3.6.13.
Potential Impact
Clients with revoked certificates can still authenticate over the gRPC listener, potentially allowing unauthorized access to etcd services. The vulnerability affects confidentiality and integrity but does not impact availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade affected etcd versions to 3.5.32 or 3.6.13 or later, where the issue is fixed. No alternative mitigations are indicated. Patch status is confirmed fixed in these versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-59818
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:Pro:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b45968715ace43d6bbda
Added to database: 07/16/2026, 10:37:13 UTC
Last enriched: 07/16/2026, 11:33:34 UTC
Last updated: 07/31/2026, 19:24:47 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.