Consul vulnerable to an authorization bypass in the Connect service mesh
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.
CVE-2026-88021
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-88021
Consul
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Consul Enterprise
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/hashicorp/consul-enterprise/",
"vendor": "HashiCorp",
"product": "Consul",
"versions": [
{
"status": "affected",
"version": "1.9.0",
"lessThan": "2.0.4",
"versionType": "semver"
}
],
"platforms": [
"64 bit",
"32 bit",
"x86",
"ARM",
"MacOS",
"Windows",
"Linux"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://github.com/hashicorp/consul-enterprise/",
"vendor": "HashiCorp",
"product": "Consul Enterprise",
"versions": [
{
"status": "affected",
"changes": [
{
"at": "1.21.18",
"status": "unaffected"
},
{
"at": "1.22.12",
"status": "unaffected"
}
],
"version": "1.9.0",
"lessThan": "2.0.4",
"versionType": "semver"
}
],
"platforms": [
"64 bit",
"32 bit",
"x86",
"ARM",
"MacOS",
"Windows",
"Linux"
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-88021
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #7966 · Revision 1
- Added to Heist Feed
- Publisher date