Atlantis: Path Traversal in Atlantis Workspace Handling Allows Out-of-Bounds Directory Deletion/Creation
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Atlantis is a self-hosted golang application that listens for Terraform pull request events via webhooks. From 0.19.8 until 0.45.0, Atlantis does not consistently validate user-controlled workspace values supplied through accepted repository-level atlantis.yaml configuration or authenticated /api/plan input before joining them into local workspace paths. Traversal segments can escape the intended per-pull workspace directory and cause clone preparation or other working-directory code paths to call os.RemoveAll, os.MkdirAll, or related filesystem operations on out-of-bounds directories before Terraform rejects the invalid workspace name. This can create, delete, or reuse writable paths with the privileges of the Atlantis process, causing integrity loss or denial of service. This issue is fixed in version 0.45.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| runatlantis | atlantis | 0.19.8 to before 0.45.0 | 0.45.0 | Patch available | CNA |
| — | github.com/runatlantis/atlantis (Go) | 0.19.8 to before 0.45.0 | 0.45.0 | Patch available | GHSA-26w5-6g95-gj28 |
- atlantis Vendorrunatlantis Affected 0.19.8 to before 0.45.0 Fixed in 0.45.0 Patch available CNA
- github.com/runatlantis/atlantis (Go) Vendor— Affected 0.19.8 to before 0.45.0 Fixed in 0.45.0 Patch available GHSA-26w5-6g95-gj28
Remediation
- Fix · CNA atlantis (runatlantis) Fixed in 0.45.0
- Fix · GHSA-26w5-6g95-gj28 github.com/runatlantis/atlantis (Go) Fixed in 0.45.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-64679
- 2026-10-03 Alias added: GHSA-26w5-6g95-gj28
References
Other 5
- https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28
- https://github.com/runatlantis/atlantis/pull/6254
- https://github.com/runatlantis/atlantis/commit/ea4e4ceebf8b387d015fff7ed8a7fcca33279afe
- https://github.com/runatlantis/atlantis/releases/tag/v0.45.0
- https://github.com/runatlantis/atlantis
More runatlantis vulnerabilities
- TI-2026-81450 OS command injection in Atlantis via pull request workspace name CVSS 3.1HIGH 8.8
- TI-2025-36203 Atlantis Exposes Service Version Publicly on /status API Endpoint CVSS 4.0MEDIUM 6.9
- TI-2026-56747 Atlantis GitHub App Setup Endpoint Returns App Credentials to Unauthenticated Callers CVSS 4.0HIGH 8.8
- TI-2024-34896 Git credentials are exposed in atlantis logs CVSS 4.0HIGH 8.5
- TI-2022-08720 Timing Attack CVSS 3.1HIGH 7.5
Sources
- CVE-2026-64679 · CVE Program
- CVE-2026-64679 · NVD
- FIRST EPSS
- GHSA-26w5-6g95-gj28 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences