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4.2

Unauthorized access to sessions in Consul via transaction API

CVE-2026-19016 · published 2 months ago
Summary

Consul versions 1.19.1 to 2.0.2 allow an authenticated user to delete sessions they shouldn't be able to. This is a security risk because it could be exploited by someone with access to the Consul server. To fix this, update to Consul 2.0.3 or later versions.

What to do
  • Update hashicorp consul enterprise to version 1.22.11.
  • Update consul to version 2.0.3.
  • Update hashicorp consul to version 2.0.3 or later.
Affected software
Ecosystem VendorProductAffected versions
– hashicorp consul < 2.0.3
– hashicorp consul enterprise < 2.0.3
Fix: upgrade to 1.22.11
Debian:11 debian consul All versions
Bitnami – consul >= 1.19.1, < 2.0.3
Fix: upgrade to 2.0.3
Original advisory text
Authorization bypass for session deletion in the transaction API
Consul Community Edition and Consul Enterprise 1.19.1 through 2.0.2 did not enforce the {{session:write}} ACL permission for session deletion operations submitted through the transaction API. An authenticated caller with network access to the Consul server RPC port could delete arbitrary sessions without holding the required permission. This vulnerability, CVE-2026-19016, is fixed in Consul 2.0.3 and Consul Enterprise 1.21.17, 1.22.11, and 2.0.3.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
4.2 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-22Path Traversal
Timeline
Published7 Aug 2026
Updated3 Nov 2026
First seen7 Aug 2026
Sources
DEBIAN-CVE-2026-19016 · OSV
CVE-2026-19016 · OSV
CVE-2026-19016 · NVD
CVE-2026-19016 · MITRE
BIT-consul-2026-19016 · OSV
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