Security fix · CVE-2026-116676

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

Q: Which versions are affected?

Compare what you have installed with 0.4.0 → 0.47.1, >= 0.4.0, <= 0.47.0. Compare the installed version with the linked vendor advisory before you change production.

Q: What should an analyst verify?

CWE-78: OS Command Injection. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Published Oct 27, 2026 · catalog updated Oct 27, 2026 · Atlantis: OS command injection

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-116676. EPSS is 0.47%. Act only if a listed version of Atlantis: OS command injection is installed.

Gaps on this record

The stored product name is a package slug. The name on this page is taken from the title (Atlantis: OS command injection).
No vendor fix or required action is stored. Compare the linked advisory before you change production.

Severity: High8.8
Known exploitation: Not in CISA/VulnCheck KEV
EPSS: 0.47%
Remediation: Version ranges on file
Affected products: Go github.com/runatlantis/atlantis · go github.com/runatlantis/atlantis · golang github.com

### Summary Atlantis passes the Terraform value from a pull request's 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, , or permission to run . The executed command inherits the Atlantis process environment, which commonly contains cloud-provider, Terraform, and VCS credentials. ### Details Verified against current commit on August 13, 2026. The vulnerable data flow is: 1. The PR-controlled project workspace is validated in [ ](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 [ ](https://github.com/runatlantis/atlantis/blob/92ce5c51d1a050357e44df3535483425e59fa984/server/core/runtime/workspace_step_runner_delegate.go#L86-L96): 3. Terraform arguments are concatenated into a single string using in [ ](https://github.com/runatlantis/atlantis/blob/92ce5c51d1a050357e44df3535483425e59fa984/server/core/terraform/tfclient/terraform_client.go#L451-L468): 4. The resulting string is executed through in [ ](https://github.com/runatlantis/atlantis/blob/92ce5c51d1a050357e44df3535483425e59fa984/server/core/terraform/tfclient/terraform_client.go#L416-L427): Consequently, a workspace such as: produces commands equivalent to: was confirmed to return no error for this workspace value. Atlantis documents that planning untrusted Terraform can already be dangerous because providers and external data sources execute code. The distinct issue here is that an ordinary project configuration field becomes shell source, bypassing the explicit control and requiring no malicious provider, external data sour

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

Go github.com/runatlantis/atlantis0.4.0 → 0.47.1
go github.com/runatlantis/atlantis>= 0.4.0, <= 0.47.0
golang github.comversion unspecified

How to fix CVE-2026-116676

Upgrade
CVE-2026-116676 lists a fix boundary at 0.47.1. Compare the installed build with that boundary before you change production.
Version check
Affected <= 0.47.0
Advisory
Open the cve_org record and follow its fix.
Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-116676. EPSS is 0.47%. Act only if a listed version of Atlantis: OS command injection is installed.

Which versions are affected?

Compare what you have installed with 0.4.0 → 0.47.1, >= 0.4.0, <= 0.47.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

HashiCorp Terraform security

Code

The project this record applies to. Exploit listings stay in References.

Repository · github.com

Timeline

Detection, updates, and resolution for this record.

Oct 27, 2026 · GitHub Advisory Database
Detected
### Summary Atlantis passes the Terraform value from a pull request's 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, , or permission to run . The executed command inheri
Oct 27, 2026 · GitHub Advisory Database
Fix available
github.com/runatlantis/atlantis fixed in 0.47.1
Oct 27, 2026 · GitHub Advisory Database
Fix available
github.com/runatlantis/atlantis fixed in 0.47.1
Oct 27, 2026 · GitHub Advisory Database
Updated
### Summary Atlantis passes the Terraform value from a pull request's 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, , or permission to run . The executed command inheri

Sources

CVE.orgVulnerability recordCVE-2026-116676
Official CVE identifier
cve.org
FIRST EPSSExploitation probabilityCVE-2026-116676
30-day exploitation probability 0.47%
first.org
GitHub Advisory DatabasePackage advisoryGHSA-rjh2-4xgw-p2hj
GitHub Advisory Database record mirrored by OSV.
github.com
GitLab Advisory DatabasePackage advisoryCVE-2026-116676
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, allow_custom_workflows, or permission to
advisories.gitlab.com
Go Vulnerability DatabasePackage advisoryGHSA-rjh2-4xgw-p2hj
Atlantis: OS command injection through PR-controlled Terraform workspace enables RCE during plan
osv.dev
OpenSSF OSV / OSV ScannerPackage advisoryGHSA-rjh2-4xgw-p2hj
Atlantis: OS command injection through PR-controlled Terraform workspace enables RCE during plan
osv.dev

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

FIRST EPSSNov 6, 2026
Go Vulnerability DatabaseOct 28, 2026
GitHub Advisory DatabaseOct 28, 2026
OpenSSF OSV / OSV ScannerOct 28, 2026
CVE.orgOct 28, 2026
GitLab Advisory DatabaseOct 28, 2026

Priority score

14/100

Evidence confidence: High

Several independent sources name this vulnerability.

Confirmed exploitation0/30
EPSS probability1/20
CVSS severity13/15
Public exploit0/10
Internet exposure0/10
Product prevalence0/5
Detection0/5
Threat research0/5

Decision signals

Four separate signals — do not infer one from another.

High

CVSS severity
8.8 v3.1
Technical impact. Separate from exploitation likelihood.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS probability
0.47% · p40.25%
Estimated probability of exploitation within 30 days (FIRST).
Known exploitation
No verified KEV listing
Evidence from CISA KEV or VulnCheck KEV only — not from EPSS alone.
Patch availability
Version ranges on file
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

Stacks

Go Terraform

Weakness

CWE-78
OS Command Injection
MITRE definition

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