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TI-2026-60046 Aliases CVE-2026-88021GHSA-9p3q-p26q-fxxc

Consul vulnerable to an authorization bypass in the Connect service mesh

Priority LOW 33CWE-185Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Consul and Consul Enterprise are vulnerable to an authorization bypass in the Connect service mesh that may allow a service to reach a destination it is not authorized to access. When building Envoy RBAC rules to enforce Connect intentions, Consul did not correctly escape certain characters in service names, namespaces, and partitions, causing the generated authorization rules to match more broadly than intended. This vulnerability (CVE-2026-88021) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00335 27th percentileScored 2026-11-07
Fix Fixed Consul (HashiCorp): 2.0.4Consul Enterprise (HashiCorp): 2.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
HashiCorpConsul1.9.0 to before 2.0.42.0.4Patch availableCNA
HashiCorpConsul Enterprise1.9.0 to before 2.0.42.0.4Patch availableCNA
  • Consul VendorHashiCorp Affected 1.9.0 to before 2.0.4 Fixed in 2.0.4 Patch available CNA
  • Consul Enterprise VendorHashiCorp Affected 1.9.0 to before 2.0.4 Fixed in 2.0.4 Patch available CNA

Remediation

  • Fix · CNA Consul (HashiCorp) Fixed in 2.0.4
  • Fix · CNA Consul Enterprise (HashiCorp) Fixed in 2.0.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    HashiCorp Consul, Consul Enterprise 2.0.4

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-59475 Consul vulnerable to an authorization bypass in the catalog node-write pathPriority LOW 36
    • TI-2026-59477 Consul vulnerable to a denial of service in the native RPC listenerPriority LOW 29
    • TI-2026-59478 Consul vulnerable to an authorization bypass in the catalog deregistration pathPriority LOW 24
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-88021
  2. 2026-10-03 Alias added: GHSA-9p3q-p26q-fxxc

References

Other 1

  • TI-2024-01904 Vault Cert Auth Method Did Not Correctly Validate Non-CA Certificates CVSS 3.1CRITICAL 9.8
  • TI-2021-18437 HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4… CVSS 3.1HIGH 8.8
  • TI-2026-06570 Nomad vulnerable to path traversal in dynamic host volume which may lead to code execution CVSS 3.1HIGH 8.8
  • TI-2020-17753 The official Consul Docker images 0.7.1 through 1.4.2 contain a blank password for a root… CVSS 3.1CRITICAL 9.8
  • TI-2026-13641 consul-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode CVSS 3.1CRITICAL 10.0
  • TI-2026-13778 terraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode CVSS 3.1CRITICAL 10.0
See all 246 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences