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CVE-2026-88021— Consul vulnerable to an authorization bypass in the Connect service mesh

Quick assessment

Affected
HashiCorp Consul
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Consul 和 Consul Enterprise 在 Connect 服务网格中存在一个授权绕过漏洞，可能导致服务访问其未被授权访问的目标服务。在构建 Envoy RBAC 规则以执行 Connect 意图（intentions）时，Consul 未正确转义服务名称、命名空间和分区中的某些字符，导致生成的授权规则比预期匹配范围更广。该漏洞（CVE-2026-88021）已在 Consul 2.0.4 以及 Consul Enterprise 1.21.18、1.22.12 和 2.0.4 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
HashiCorp Consul 1.9.0< 2.0.4 affected
HashiCorp Consul Enterprise 1.9.0< 2.0.4 affected
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I. Basic Information for CVE-2026-88021

Vulnerability Information
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Vulnerability Title
Consul vulnerable to an authorization bypass in the Connect service mesh
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Consul 1.9.0 ~ 2.0.4 -
HashiCorp Consul Enterprise 1.9.0 ~ 2.0.4 -

II. Public POCs for CVE-2026-88021

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III. Intelligence Information for CVE-2026-88021

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Vendor Advisories for CVE-2026-88021 (1)

Same Patch Batch · HashiCorp · 2026-09-10 · 5 CVEs total

CVE-2026-87090 8.3 HIGH Consul vulnerable to an authorization bypass in the catalog node-write path
CVE-2026-87993 7.7 HIGH Consul-template vulnerable to an information disclosure issue in error handling
CVE-2026-87106 6.5 MEDIUM Consul vulnerable to a denial of service in the native RPC listener
CVE-2026-87107 5.4 MEDIUM Consul vulnerable to an authorization bypass in the catalog deregistration path

IV. Related Vulnerabilities

Same product: Consul
Same vendor: HashiCorp
Same weakness: CWE-185

V. Comments for CVE-2026-88021

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