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TI-2026-80535 Aliases CVE-2026-105608GHSA-5jgf-46qp-g9jf

Authorization bypass in Consul service mesh proxy registration

Priority MEDIUM 40CWE-178Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

HashiCorp Consul and Consul Enterprise from 2.0.4 before 2.1.0 are affected. A case sensitivity error (CWE-178) lets a user with service write permission apply Envoy escape-hatch configuration during service mesh proxy registration without the required mesh write permission. An authenticated user with low privileges can trigger it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

HashiCorp Consul and Consul Enterprise are vulnerable to an authorization bypass in service mesh proxy registration. This may allow a user with service write permission to apply Envoy escape-hatch configuration without the required mesh write permission. This vulnerability (CVE-2026-105608) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00452 39th percentileScored 2026-11-07
Fix Partial Consul (HashiCorp): 2.1.0Consul Enterprise (HashiCorp): 2.1.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
HashiCorpConsul2.0.4 to before 2.1.02.1.0Patch availableCNA
HashiCorpConsul Enterprise2.0.4 to before 2.1.02.1.0Patch availableCNA
  • Consul VendorHashiCorp Affected 2.0.4 to before 2.1.0 Fixed in 2.1.0 Patch available CNA
  • Consul Enterprise VendorHashiCorp Affected 2.0.4 to before 2.1.0 Fixed in 2.1.0 Patch available CNA

Remediation

Consul is fixed in 2.1.0, and Consul Enterprise is fixed in 2.1.0 and 1.21.19. Red Hat lists Red Hat Enterprise Linux 9 as affected with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Consul (HashiCorp) Fixed in 2.1.0
  • Fix · CNA Consul Enterprise (HashiCorp) Fixed in 2.1.0

Fixed in the same release

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

  • Release ·

    HashiCorp Consul, Consul Enterprise 2.1.0

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-80543 Denial of service in HashiCorp Consul HTTP API exhausts memoryPriority LOW 39
    • TI-2026-80532 Consul authorization bypass exposes leaf certificates and private keysPriority LOW 38
    • TI-2026-80544 Authorization bypass in HashiCorp Consul health check registrationPriority LOW 28
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-105608
  2. 2026-10-26 CISA SSVC decision points changed
  3. 2026-10-26 Priority changed: MEDIUM → LOW
  4. 2026-10-27 Alias added: GHSA-5jgf-46qp-g9jf
  5. 2026-10-27 Priority changed: LOW → MEDIUM
  6. 2026-11-02 Affected versions changed · Red Hat
  7. 2026-11-02 CVSS score added · Red Hat
  8. 2026-11-06 Affected versions changed · Red Hat

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