TI-2026-59477 Aliases CVE-2026-87106 GHSA-q5mw-fjrj-6qmh

Consul vulnerable to a denial of service in the native RPC listener

LOW 29CWE-400Published 2026-09-10 · Updated 2026-09-10

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

Consul and Consul Enterprise are vulnerable to a denial of service in the native RPC listener that may allow an authenticated client to exhaust server memory before ACL authorization is evaluated. A client that can complete the internal RPC mTLS handshake may exploit this issue without holding a valid ACL token. This vulnerability (CVE-2026-87106) 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 0.00411 35th 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

Vendor	Product	Affected versions	Fixed in	Status	Source
HashiCorp	Consul	1.21.0 to before 2.0.4	2.0.4	Patch available	CNA
HashiCorp	Consul Enterprise	1.21.0 to before 2.0.4	2.0.4	Patch available	CNA

Consul VendorHashiCorp Affected 1.21.0 to before 2.0.4 Fixed in 2.0.4 Patch available CNA
Consul Enterprise VendorHashiCorp Affected 1.21.0 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 · 2026-09-10
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-2026-60046 Consul vulnerable to an authorization bypass in the Connect service meshPriority LOW 33
- TI-2026-59478 Consul vulnerable to an authorization bypass in the catalog deregistration pathPriority LOW 24
Show all 4 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-87106
2026-10-03 Alias added: GHSA-q5mw-fjrj-6qmh

References

Other 1

https://discuss.hashicorp.com/t/hcsec-2026-35-consul-vulnerable-to-a-denial-of-service-in-the-native-rpc-listener/77737

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