Vulnerability-Lookup

CVE-2026-88021 (GCVE-0-2026-88021)

Vulnerability from cvelistv5 – Published: 2026-09-10 18:58 – Updated: 2026-09-10 19:21

Title

Consul vulnerable to an authorization bypass in the Connect service mesh

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 19:21 UTC

CWE

CWE-185 - Incorrect Regular Expression

Assigner

HashiCorp mitre root

References

1 reference

URL	Tags
https://discuss.hashicorp.com/t/hcsec-2026-37-con…

Impacted products

2 products

Vendor	Product	Version	CPE status
HashiCorp	Consul	Affected: 1.9.0 , < 2.0.4 (semver)	guessed
HashiCorp	Consul Enterprise	Affected: 1.9.0 , < 2.0.4 (semver)	guessed

Credits

This issue was reported to HashiCorp by Đoàn Thành.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-88021

Vulnerability from fkie_nvd - Published: 2026-09-10 19:17 - Updated: 2026-09-10 20:17

Severity

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Summary

References

	URL	Tags
	security@hashicorp.com	https://discuss.hashicorp.com/t/hcsec-2026-37-consul-vulnerable-to-an-authorization-bypass-in-the-connect-service-mesh/77739

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "64 bit",
            "32 bit",
            "x86",
            "ARM",
            "MacOS",
            "Windows",
            "Linux"
          ],
          "product": "Consul",
          "repo": "https://github.com/hashicorp/consul-enterprise/",
          "vendor": "HashiCorp",
          "versions": [
            {
              "lessThan": "2.0.4",
              "status": "affected",
              "version": "1.9.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "64 bit",
            "32 bit",
            "x86",
            "ARM",
            "MacOS",
            "Windows",
            "Linux"
          ],
          "product": "Consul Enterprise",
          "repo": "https://github.com/hashicorp/consul-enterprise/",
          "vendor": "HashiCorp",
          "versions": [
            {
              "changes": [
                {
                  "at": "1.21.18",
                  "status": "unaffected"
                },
                {
                  "at": "1.22.12",
                  "status": "unaffected"
                }
              ],
              "lessThan": "2.0.4",
              "status": "affected",
              "version": "1.9.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@hashicorp.com"
    }
  ],
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      "lang": "en",
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    }
  ],
  "id": "CVE-2026-88021",
  "lastModified": "2026-09-10T20:17:31.317",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
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          "baseScore": 7.1,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
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        "type": "Secondary"
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GHSA-9P3Q-P26Q-FXXC

Vulnerability from github – Published: 2026-09-10 21:31 – Updated: 2026-09-10 21:31

Details

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-88021"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-185"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
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  },
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  "id": "GHSA-9p3q-p26q-fxxc",
  "modified": "2026-09-10T21:31:35Z",
  "published": "2026-09-10T21:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88021"
    },
    {
      "type": "WEB",
      "url": "https://discuss.hashicorp.com/t/hcsec-2026-37-consul-vulnerable-to-an-authorization-bypass-in-the-connect-service-mesh/77739"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-88021

Vulnerability from osv_ubuntu

Published

2026-09-11 00:00

Modified

2026-09-11 00:00

Summary

Details

(Consul and Consul Enterprise are vulnerable to an authorization bypass ...)

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-88021	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-88021	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "consul",
            "binary_version": "0.6.4~dfsg-3"
          },
          {
            "binary_name": "golang-github-hashicorp-consul-dev",
            "binary_version": "0.6.4~dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "consul",
        "purl": "pkg:deb/ubuntu/consul@0.6.4~dfsg-3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.4~dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "consul",
            "binary_version": "1.5.2+dfsg2-14"
          },
          {
            "binary_name": "golang-github-hashicorp-consul-dev",
            "binary_version": "1.5.2+dfsg2-14"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "consul",
        "purl": "pkg:deb/ubuntu/consul@1.5.2+dfsg2-14?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.7~dfsg1-5ubuntu1",
        "1.4.4~dfsg1-2ubuntu2",
        "1.5.2+dfsg1-6",
        "1.5.2+dfsg1-10",
        "1.5.2+dfsg1-12",
        "1.5.2+dfsg2-14"
      ]
    },
    {
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          {
            "binary_name": "consul",
            "binary_version": "1.8.7+dfsg1-3"
          },
          {
            "binary_name": "golang-github-hashicorp-consul-dev",
            "binary_version": "1.8.7+dfsg1-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "consul",
        "purl": "pkg:deb/ubuntu/consul@1.8.7+dfsg1-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.4+dfsg1-1",
        "1.8.7+dfsg1-3"
      ]
    }
  ],
  "aliases": [],
  "details": "(Consul and Consul Enterprise are vulnerable to an authorization bypass ...)",
  "id": "UBUNTU-CVE-2026-88021",
  "modified": "2026-09-11T00:00:00Z",
  "published": "2026-09-11T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88021"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88021"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88021"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-88021 (GCVE-0-2026-88021)

FKIE_CVE-2026-88021

GHSA-9P3Q-P26Q-FXXC

ubuntu-cve-2026-88021

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature