8.8 High

Atlantis: OS command injection through PR-controlled Terraform workspace enables RCE during plan

CVE-2026-116676

Summary Atlantis passes the Terraform workspace value from a pull request's atlantis.yaml into a shell command without quoting or escaping it. A contributor whose pull request is eligible for an Atlantis plan can include shell metacharacters in the workspace name and execute arbitrary commands as the Atlantis service account. This does not require custom workflows, allowcustomworkflows, or permission to run terraform apply. The executed command inherits the Atlantis process environment, which commonly contains cloud-provider, Terraform, and VCS credentials. Details Verified against current upstream/main commit 92ce5c51d1a050357e44df3535483425e59fa984 on August 13, 2026. The vulnerable data flow is: 1. The PR-controlled project workspace is validated in [server/core/config/raw/project.go](https://github.com/runatlantis/atlantis/blob/92ce5c51d1a050357e44df3535483425e59fa984/server/core/config/raw/project.go#L139-L149). Validation rejects only .., /, and \. Shell metacharacters such as ;, #, $, redirections, and whitespace remain permitted. 2. The workspace is passed directly as a Terraform command argument in…

Assessment

CVSS: 8.8 (v3.1)
Severity: High
EPSS: 0.00466% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 27 October 2026
Last updated: 27 October 2026
Affected: go · github.com/runatlantis/atlantis
Weakness: CWE-78

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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