CVE-2026-87106

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

MEDIUM

6.5

CVSS Score

Published: September 10, 2026 at 06:55 PM UTC

Updated: September 10, 2026 at 07:58 PM UTC

1 product affected across 1 vendorConsul

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Consul · Hashicorp

60%

1.21.0 ≤ v < 2.0.41.21.0

Affected range stops below 2.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMHashiCorp

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-400

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