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TI-2026-80543 Aliases CVE-2026-105626GHSA-924q-7grr-82mf

Denial of service in HashiCorp Consul HTTP API exhausts memory

Priority LOW 39CWE-770Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-770.

Summary

HashiCorp Consul and Consul Enterprise from 0.6.0 before 2.1.0 are affected. The HTTP API allocates resources without limits (CWE-770), so requests can exhaust memory. An unauthenticated remote attacker can exhaust memory on a Consul agent, causing a denial of service.

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 a denial of service in the HTTP API that may allow an unauthenticated attacker to exhaust memory on a Consul agent. This vulnerability (CVE-2026-105626) 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 0.0043 37th 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
Yes
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
HashiCorpConsul0.6.0 to before 2.1.02.1.0Patch availableCNA
HashiCorpConsul Enterprise0.6.0 to before 2.1.02.1.0Patch availableCNA
  • Consul VendorHashiCorp Affected 0.6.0 to before 2.1.0 Fixed in 2.1.0 Patch available CNA
  • Consul Enterprise VendorHashiCorp Affected 0.6.0 to before 2.1.0 Fixed in 2.1.0 Patch available CNA

Remediation

Upgrade Consul to 2.1.0 or later. Upgrade Consul Enterprise to 2.1.0 or 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-2026-80535 Authorization bypass in Consul service mesh proxy registrationPriority MEDIUM 40
    • 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-2026-105626
  2. 2026-10-26 CISA SSVC decision points changed
  3. 2026-10-26 Priority changed: MEDIUM → LOW
  4. 2026-10-27 Alias added: GHSA-924q-7grr-82mf
  5. 2026-11-02 Affected versions changed · Red Hat
  6. 2026-11-02 CVSS score added · Red Hat
  7. 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