# CVE-2026-81034: Netmaker through 1.6.0 Improper Certificate Validation in SMTP Client

> Netmaker disables TLS certificate verification for SMTP, allowing attackers to intercept password reset tokens and invitation links via man-in-the-middle attacks.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 26 Aug 2026
- **Also known as:** GHSA-36r8-h3x6-x34c

## What is CVE-2026-81034?

CVE-2026-81034 is a high-severity vulnerability in gravitl netmaker, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Netmaker disables certificate verification on the connection to the configured mail server. The sender in pro/email/smtp.go assigns a TLS configuration whose skip-verify field is set to true unconditionally, directly beneath a comment stating that the setting should be false in production. No configuration value governs it and no code path restores verification, so the client accepts any certificate the mail server presents, including one an interposing party supplies. Mail that Netmaker sends over that connection includes password-reset messages carrying single-use tokens and user invitations carrying enrolment links, so a party positioned on the path between the server and its mail relay can read those messages in transit and use a captured reset token before the intended recipient does. The setting is absent from the development branch but present in the latest release.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2026-81034?


## How do I fix CVE-2026-81034?

No fix has been published for CVE-2026-81034 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81034 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81034 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81034 and fix it if it is affected.

What it is: CVE-2026-81034 is a high-severity vulnerability in gravitl netmaker, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81034 exists.

Affected product: gravitl netmaker. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-81034/ (Markdown: https://insights.sbomify.com/CVE-2026-81034/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81034
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81034
- OSV: https://osv.dev/vulnerability/CVE-2026-81034

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81034/
Summaries are generated and may contain mistakes; the official description above is the record.