Vulnerability · Published Oct 27, 2026 · Assigned by GitHub_M
CVE-2026-116676Atlantis: OS command injection through PR-controlled Terraform workspace enables RCE during plan
High 8.8
In plain English
A high-severity OS command injection in atlantis from runatlantis. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Atlantis is a self-hosted golang application that listens for Terraform pull request events via webhooks. From version 0.4.0 until 0.47.1, Atlantis passes the pull-request-controlled workspace value from atlantis.yaml into Terraform command arguments that are joined with strings.Join(args, " ") and executed through sh -c. An authenticated contributor whose pull request is eligible for an Atlantis plan can include shell metacharacters in the workspace name, causing arbitrary commands to execute as the Atlantis service account without custom workflows, apply permission, or a malicious Terraform provider. External contributors can reach the flaw through fork pull requests only when --allow-fork-prs is enabled, while eligible same-repository branches do not require that option. The commands inherit the Atlantis process environment and can access cloud-provider, Terraform, and version-control credentials as well as files, state, and network resources available to the service. This issue is fixed in version 0.47.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/runatlantis/atlantis | 0.47.1 | GHSA-rjh2-4xgw-p2hj |
| Go | github.com/runatlantis/atlantis | 0.47.1 | GO-2026-6871 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| runatlantis | atlantis | >= 0.4.0, < 0.47.1 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/runatlantis/atlantis/security/advisories/GHSA-rjh2-4xgw-p2hj x_refsource_CONFIRM
- https://github.com/runatlantis/atlantis/pull/6792 x_refsource_MISC
- https://github.com/runatlantis/atlantis/commit/8dd22b4d0a9d7c129fdbf6a3398dd1c4cf8c3a59 x_refsource_MISC
- https://github.com/runatlantis/atlantis/commit/f04df0d53f0544d9eb6f5026dd8b74fbefd82ac8 x_refsource_MISC
- https://github.com/runatlantis/atlantis/releases/tag/v0.47.1 x_refsource_MISC