HashiCorp Consul is widely used in cloud/service-mesh infrastructures; this flaw allows node identity takeover and can disrupt service trust and operations.
CVE-2026-87090
Auth bypass lets attacker delete node registrations and assume node identity.
Is CVE-2026-87090 being exploited?
Not confirmed. CVE-2026-87090 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.21% probability of exploitation in the next 30 days.
How severe is CVE-2026-87090?
CVE-2026-87090 is rated High with a CVSS score of 8.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-87090?
Yes. A fix has been recorded for CVE-2026-87090. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-87090 affect?
CVE-2026-87090 affects HashiCorp Consul (OSS) < 2.0.4, HashiCorp Consul Enterprise < 1.21.18, HashiCorp Consul Enterprise < 1.22.12, HashiCorp Consul Enterprise < 2.0.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-87090?
Upgrade to fixed versions; restrict/rotate node-write tokens; audit node registrations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated actor with node-write on any node can delete another node's catalog entry and assume its node identity, enabling impersonation and service disruption.
Patch when possible
- affected>= 0.1.0 and < 2.0.4
- affected>= 0.1.0 and < 2.0.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.