Vulnerability-Lookup

CVE-2026-64679 (GCVE-0-2026-64679)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:29 – Updated: 2026-08-25 17:05

Title

Atlantis: Path Traversal in Atlantis Workspace Handling Allows Out-of-Bounds Directory Deletion/Creation

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.

Severity

8.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 17:04 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73 - External Control of File Name or Path

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/runatlantis/atlantis/security/…	x_refsource_CONFIRM
https://github.com/runatlantis/atlantis/pull/6254	x_refsource_MISC
https://github.com/runatlantis/atlantis/commit/ea…	x_refsource_MISC
https://github.com/runatlantis/atlantis/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
runatlantis	atlantis	Affected: >= 0.19.8, < 0.45.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-64679

Vulnerability from fkie_nvd - Published: 2026-08-21 21:17 - Updated: 2026-10-12 16:10

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/runatlantis/atlantis/commit/ea4e4ceebf8b387d015fff7ed8a7fcca33279afe
	security-advisories@github.com	https://github.com/runatlantis/atlantis/pull/6254
	security-advisories@github.com	https://github.com/runatlantis/atlantis/releases/tag/v0.45.0
	security-advisories@github.com	https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "atlantis",
          "vendor": "runatlantis",
          "versions": [
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    },
    {
      "lang": "es",
      "value": "Atlantis es una aplicaci\u00f3n golang autoalojada que escucha eventos de pull request de Terraform a trav\u00e9s de webhooks. Desde la versi\u00f3n 0.19.8 hasta la 0.45.0, Atlantis no valida consistentemente los valores de espacio de trabajo controlados por el usuario proporcionados a trav\u00e9s de la configuraci\u00f3n atlantis.yaml aceptada a nivel de repositorio o la entrada autenticada de /API/plan antes de unirlos en rutas de espacio de trabajo locales. Los segmentos de recorrido pueden escapar del directorio de espacio de trabajo previsto por pull y causar que la preparaci\u00f3n de clonaci\u00f3n u otras rutas de c\u00f3digo de directorio de trabajo llamen a os.RemoveAll, os.MkdirAll o a operaciones de sistema de archivos relacionadas en directorios fuera de los l\u00edmites antes de que Terraform rechace el nombre de espacio de trabajo no v\u00e1lido. Esto puede crear, eliminar o reutilizar rutas escribibles con los privilegios del proceso de Atlantis, causando p\u00e9rdida de integridad o denegaci\u00f3n de servicio. Este problema est\u00e1 solucionado en la versi\u00f3n 0.45.0."
    }
  ],
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  "lastModified": "2026-10-12T16:10:00.220",
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    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-26W5-6G95-GJ28

Vulnerability from github – Published: 2026-08-21 20:55 – Updated: 2026-08-21 20:55

Summary

Atlantis Workspace Handling has Path Traversal that Allows Out-of-Bounds Directory Deletion/Creation

Details

Summary

Atlantis versions >= 0.19.8 and < 0.45.0 did not consistently validate user-controlled workspace values before using them to construct local workspace paths.

A crafted workspace value containing path traversal segments could cause Atlantis to resolve workspace paths outside the intended per-pull workspace directory. In vulnerable versions or code paths, Atlantis could create, use, or remove/recreate out-of-bounds directories with the privileges of the Atlantis process user, before Terraform rejected the invalid workspace name.

The issue is fixed in Atlantis 0.45.0.

Details

The issue is a path traversal vulnerability in Atlantis workspace handling. workspace values can be supplied through repository-level atlantis.yaml configuration accepted by the server or through authenticated API input. A value such as ../../../../../../../../tmp/f1-canary could escape the intended Atlantis workspace root.

In affected code paths, Atlantis used the resolved workspace path for local working-directory operations. For example, workspace values were joined into repo pull paths, and clone preparation paths could call directory removal/recreation operations such as os.RemoveAll and os.MkdirAll on the resolved directory.

PoC

In a local PoC using repo-level atlantis.yaml, the following workspace value caused Atlantis to resolve and use /tmp/f1-canary outside ~/.atlantis/repos/...:

version: 3
projects:
  - dir: .
    workspace: ../../../../../../../../tmp/f1-canary

Atlantis logs showed the out-of-bounds directory being created and Terraform being run with /tmp/f1-canary as the working directory. Terraform rejected the workspace name only after Atlantis had already used the out-of-bounds path.

Impact

A user who can cause Atlantis to process a crafted workspace value, for example through repository-level atlantis.yaml configuration accepted by the server or an authenticated /api/plan request, may cause filesystem operations to occur outside the intended workspace boundary.

Depending on the affected version, code path, deployment configuration, and filesystem permissions, this may result in unintended directory creation, deletion, or reuse, integrity impact to writable local paths, or denial of service. Containerized deployments may limit host impact, but writable mounted volumes and persistent Atlantis data paths remain relevant.

Severity

8.1 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/runatlantis/atlantis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.19.8"
            },
            {
              "fixed": "0.45.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-64679"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-73"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-21T20:55:33Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nAtlantis versions `\u003e= 0.19.8` and `\u003c 0.45.0` did not consistently validate user-controlled `workspace` values before using them to construct local workspace paths.\n\nA crafted workspace value containing path traversal segments could cause Atlantis to resolve workspace paths outside the intended per-pull workspace directory. In vulnerable versions or code paths, Atlantis could create, use, or remove/recreate out-of-bounds directories with the privileges of the Atlantis process user, before Terraform rejected the invalid workspace name.\n\nThe issue is fixed in Atlantis `0.45.0`.\n\n### Details\nThe issue is a path traversal vulnerability in Atlantis workspace handling. `workspace` values can be supplied through repository-level `atlantis.yaml` configuration accepted by the server or through authenticated API input. A value such as `../../../../../../../../tmp/f1-canary` could escape the intended Atlantis workspace root.\n\nIn affected code paths, Atlantis used the resolved workspace path for local working-directory operations. For example, workspace values were joined into repo pull paths, and clone preparation paths could call directory removal/recreation operations such as `os.RemoveAll` and `os.MkdirAll` on the resolved directory.\n\n### PoC\nIn a local PoC using repo-level `atlantis.yaml`, the following workspace value caused Atlantis to resolve and use `/tmp/f1-canary` outside `~/.atlantis/repos/...`:\n\n```yaml\nversion: 3\nprojects:\n  - dir: .\n    workspace: ../../../../../../../../tmp/f1-canary\n```\n\nAtlantis logs showed the out-of-bounds directory being created and Terraform being run with `/tmp/f1-canary` as the working directory. Terraform rejected the workspace name only after Atlantis had already used the out-of-bounds path.\n\n### Impact\nA user who can cause Atlantis to process a crafted `workspace` value, for example through repository-level `atlantis.yaml` configuration accepted by the server or an authenticated `/api/plan` request, may cause filesystem operations to occur outside the intended workspace boundary.\n\nDepending on the affected version, code path, deployment configuration, and filesystem permissions, this may result in unintended directory creation, deletion, or reuse, integrity impact to writable local paths, or denial of service. Containerized deployments may limit host impact, but writable mounted volumes and persistent Atlantis data paths remain relevant.",
  "id": "GHSA-26w5-6g95-gj28",
  "modified": "2026-08-21T20:55:33Z",
  "published": "2026-08-21T20:55:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/runatlantis/atlantis/security/advisories/GHSA-26w5-6g95-gj28"
    },
    {
      "type": "WEB",
      "url": "https://github.com/runatlantis/atlantis/pull/6254"
    },
    {
      "type": "WEB",
      "url": "https://github.com/runatlantis/atlantis/commit/ea4e4ceebf8b387d015fff7ed8a7fcca33279afe"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/runatlantis/atlantis"
    },
    {
      "type": "WEB",
      "url": "https://github.com/runatlantis/atlantis/releases/tag/v0.45.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Atlantis Workspace Handling has Path Traversal that Allows Out-of-Bounds Directory Deletion/Creation"
}

Sightings

Author	Source	Type	Date	Other

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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CVE-2026-64679 (GCVE-0-2026-64679)

FKIE_CVE-2026-64679

GHSA-26W5-6G95-GJ28

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