CVE-2026-88021 Consul - Authorization Bypass

Consul and Consul Enterprise contain an authorization bypass caused by improper escaping of characters in service names, namespaces, and partitions in Connect service mesh, letting unauthorized services access restricted destinations, exploit requires crafted service names.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-185

Vendor fix

Update to Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12, 2.0.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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