Vulnerability-Lookup

CVE-2026-71493 (GCVE-0-2026-71493)

Vulnerability from cvelistv5 – Published: 2026-08-21 17:52 – Updated: 2026-08-26 17:33

Title

Infracost: Arbitrary file read via config-template readFile symlink traversal

Summary

Infracost provides cloud cost intelligence for engineers, AI coding agents, and CI/CD. Prior to 0.10.45, the readFile, pathExists, isDir, and matchPaths template functions in internal/config/template/parser.go use a lexical filepath.Rel check and a leaf-only os.Lstat check that do not resolve an intermediate directory symlink. A repository can contain a path such as evil/file where evil points outside the checkout, causing os.ReadFile and related operations to follow the symlink and read runner-accessible files. The resulting content is rendered into generated configuration and can be surfaced through the Infracost dashboard or pull request comment, with greater impact in workflows that provide repository secrets. This issue is fixed in version 0.10.45.

Severity

5.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 17:33 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7619 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/infracost/infracost/security/a…	x_refsource_CONFIRM
https://github.com/infracost/infracost/pull/3586	x_refsource_MISC
https://github.com/infracost/infracost/commit/4d3…	x_refsource_MISC
https://github.com/infracost/infracost/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
infracost	infracost	Affected: < 0.10.45	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-71493

Vulnerability from fkie_nvd - Published: 2026-08-21 18:16 - Updated: 2026-10-14 19:10

Severity

5.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/infracost/infracost/commit/4d39331afc0e27752d16d9d91c34583e5e8487fb
	security-advisories@github.com	https://github.com/infracost/infracost/pull/3586
	security-advisories@github.com	https://github.com/infracost/infracost/releases/tag/v0.10.45
	security-advisories@github.com	https://github.com/infracost/infracost/security/advisories/GHSA-mmg6-4qmv-6pc8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "infracost",
          "vendor": "infracost",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.10.45"
            }
          ]
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      ],
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    }
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    {
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    },
    {
      "lang": "es",
      "value": "Infracost proporciona inteligencia de costos en la nube para ingenieros, agentes de codificaci\u00f3n de IA y CI/CD. Antes de la versi\u00f3n 0.10.45, las funciones de plantilla readFile, pathExists, isDir y matchPaths en internal/config/template/parser.go utilizan una verificaci\u00f3n l\u00e9xica filepath.Rel y una verificaci\u00f3n os.Lstat solo de hoja que no resuelven un enlace simb\u00f3lico de directorio intermedio. Un repositorio puede contener una ruta como evil/file donde evil apunta fuera del checkout, haciendo que os.ReadFile y operaciones relacionadas sigan el enlace simb\u00f3lico y lean archivos accesibles para el ejecutor. El contenido resultante se renderiza en la configuraci\u00f3n generada y puede mostrarse a trav\u00e9s del panel de Infracost o un comentario de solicitud de extracci\u00f3n, con mayor impacto en flujos de trabajo que proporcionan secretos de repositorio. Este problema se corrige en la versi\u00f3n 0.10.45."
    }
  ],
  "id": "CVE-2026-71493",
  "lastModified": "2026-10-14T19:10:00.297",
  "metrics": {
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          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-71493",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-26T17:33:05.338155Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T18:16:50.440",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/infracost/infracost/commit/4d39331afc0e27752d16d9d91c34583e5e8487fb"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/infracost/infracost/pull/3586"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/infracost/infracost/releases/tag/v0.10.45"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/infracost/infracost/security/advisories/GHSA-mmg6-4qmv-6pc8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-MMG6-4QMV-6PC8

Vulnerability from github – Published: 2026-09-08 18:14 – Updated: 2026-09-08 18:14

Summary

Infracost: Arbitrary file read via config-template readFile symlink traversal

Details

Impact

Path traversal via link following in the Infracost config-template parser. The readFile, pathExists, isDir, and matchPaths template functions confined repo-supplied paths with a lexical filepath.Rel check plus a leaf-only os.Lstat:

{{ readFile "evil/file" }}

With an intermediate directory symlink committed in the repo (evil -> /), the path is lexically clean and the leaf is a regular file, so both checks pass, but os.ReadFile follows the symlink and reads outside the checkout. The contents are rendered into the generated config and surfaced via the Infracost dashboard and PR comment, so anyone who can open a pull request can read files off the runner.

Affects infracost up to and including v0.10.44. Successful exploitation reads any file the CLI process can reach on the runner. Impact depends on what the run exposes: under on: pull_request (the configuration in Infracost's documentation) fork pull requests run without secrets and with a read-only token, so exposure is limited. If Infracost runs under pull_request_target, or is triggered by a same-repository pull request, the read reaches the repository's secrets, enabling secret theft. The patch confines all four functions regardless of trigger.

Patches

Fixed in v0.10.45 (#3586) by routing all four functions through security.IsPathAllowed, which resolves symlinks anywhere in the path before a segment-aware containment check. The same fix landed in config#14 and parser#144. - Installed via the official script, a package manager, or the latest Docker tag: upgrade to v0.10.45 (or later) to receive the fix. - Pinned to a specific version or image digest: bump to v0.10.45.

Workarounds

No full fix without upgrading. To limit exposure: run Infracost under on: pull_request rather than pull_request_target, and keep fork pull requests from receiving secrets (the defaults).

Severity

5.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/infracost/infracost"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.10.45"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-71493"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T18:14:00Z",
    "nvd_published_at": "2026-08-21T18:16:50Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nPath traversal via link following in the Infracost config-template parser. The `readFile`, `pathExists`, `isDir`, and `matchPaths` template functions confined repo-supplied paths with a lexical `filepath.Rel` check plus a leaf-only `os.Lstat`:\n\n```\n{{ readFile \"evil/file\" }}\n```\n\nWith an intermediate directory symlink committed in the repo (`evil -\u003e /`), the path is lexically clean and the leaf is a regular file, so both checks pass, but `os.ReadFile` follows the symlink and reads outside the checkout. The contents are rendered into the generated config and surfaced via the Infracost dashboard and PR comment, so anyone who can open a pull request can read files off the runner.\n\nAffects `infracost` up to and including `v0.10.44`. Successful exploitation reads any file the CLI process can reach on the runner. Impact depends on what the run exposes: under `on: pull_request` (the configuration in Infracost\u0027s documentation) fork pull requests run without secrets and with a read-only token, so exposure is limited. If Infracost runs under `pull_request_target`, or is triggered by a same-repository pull request, the read reaches the repository\u0027s secrets, enabling secret theft. The patch confines all four functions regardless of trigger.\n\n### Patches\n\nFixed in `v0.10.45` ([#3586](https://github.com/infracost/infracost/pull/3586)) by routing all four functions through `security.IsPathAllowed`, which resolves symlinks anywhere in the path before a segment-aware containment check. The same fix landed in [config#14](https://github.com/infracost/config/pull/14) and [parser#144](https://github.com/infracost/parser/pull/144).\n  - Installed via the official script, a package manager, or the `latest` Docker tag: upgrade to `v0.10.45` (or later) to receive the fix.\n  - Pinned to a specific version or image digest: bump to `v0.10.45`.\n\n### Workarounds\n\nNo full fix without upgrading. To limit exposure: run Infracost under `on: pull_request` rather than `pull_request_target`, and keep fork pull requests from receiving secrets (the defaults).",
  "id": "GHSA-mmg6-4qmv-6pc8",
  "modified": "2026-09-08T18:14:00Z",
  "published": "2026-09-08T18:14:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/infracost/infracost/security/advisories/GHSA-mmg6-4qmv-6pc8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71493"
    },
    {
      "type": "WEB",
      "url": "https://github.com/infracost/infracost/pull/3586"
    },
    {
      "type": "WEB",
      "url": "https://github.com/infracost/infracost/commit/4d39331afc0e27752d16d9d91c34583e5e8487fb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/infracost/infracost"
    },
    {
      "type": "WEB",
      "url": "https://github.com/infracost/infracost/releases/tag/v0.10.45"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Infracost: Arbitrary file read via config-template readFile symlink traversal"
}

Sightings

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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CVE-2026-71493 (GCVE-0-2026-71493)

FKIE_CVE-2026-71493

GHSA-MMG6-4QMV-6PC8

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