Vulnerability-Lookup

CVE-2026-34726 (GCVE-0-2026-34726)

Vulnerability from cvelistv5 – Published: 2026-04-02 18:07 – Updated: 2026-04-03 16:16

Title

Copier `_subdirectory` allows template root escape via parent-directory traversal

Summary

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.

Severity ?

4.4 (Medium)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/copier-org/copier/security/adv…	x_refsource_CONFIRM
	https://github.com/copier-org/copier/commit/cb80a…	x_refsource_MISC
	https://github.com/copier-org/copier/releases/tag…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	copier-org	copier	Affected: < 9.14.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-34726

Vulnerability from fkie_nvd - Published: 2026-04-02 19:21 - Updated: 2026-04-03 19:40

Severity ?

4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df	Patch
security-advisories@github.com	https://github.com/copier-org/copier/releases/tag/v9.14.1	Release Notes
security-advisories@github.com	https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	copier-org	copier	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:copier-org:copier:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "08914294-5C57-49CB-8D05-BBB156C6B8B1",
              "versionEndExcluding": "9.14.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier\u0027s _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1."
    }
  ],
  "id": "CVE-2026-34726",
  "lastModified": "2026-04-03T19:40:49.070",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-02T19:21:32.320",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/copier-org/copier/releases/tag/v9.14.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-85V3-4M8G-HRH6

Vulnerability from github – Published: 2026-04-01 22:28 – Updated: 2026-04-06 17:32

Summary

Copier `_subdirectory` allows template root escape via parent-directory traversal

Details

Summary

Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root.

As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE.

Details

The relevant code path is:

the template defines _subdirectory
Copier renders that string
template_copy_root returns self.template.local_abspath / subdir
Copier walks that directory as the template root

Relevant code:

The effective sink is:

subdir = self._render_string(self.template.subdirectory) or ""
return self.template.local_abspath / subdir

There is no check that the resulting path stays inside the template directory.

The documentation for _subdirectory describes it as:

Subdirectory to use as the template root when generating a project.

and explains it as a way to separate template metadata from template source code:

https://github.com/copier-org/copier/blob/7aa7021bd73797c982492bac3535515d4484fdb7/docs/configuring.md#L1582-L1646

That description fits values like template or poetry, but not ...

PoC

PoC 1: `_subdirectory: ..` escapes to the parent directory

mkdir -p root/template dst
echo 'loot' > root/loot.txt
printf '%s\n' '_subdirectory: ..' > root/template/copier.yml

copier copy --overwrite root/template dst
find dst -maxdepth 3 -type f | sort
cat dst/loot.txt

Expected output includes:

dst/loot.txt
dst/template/copier.yml
loot

This shows Copier is rendering from root/ rather than from root/template/.

Impact

If a user runs Copier on an untrusted template, that template can change the effective template root and make Copier render files from outside the intended template directory.

Practical impact:

template-root escape via ..
rendering of parent-directory files that were not meant to be part of the template
possible without --UNSAFE

Severity ?

4.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "copier"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34726"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T22:28:49Z",
    "nvd_published_at": "2026-04-02T19:21:32Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nCopier\u0027s `_subdirectory` setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as `..` and uses it directly when selecting the template root.\n\nAs a result, a template can escape its own directory and make Copier render files from the parent directory without `--UNSAFE`.\n\n### Details\n\nThe relevant code path is:\n\n1. the template defines `_subdirectory`\n2. Copier renders that string\n3. `template_copy_root` returns `self.template.local_abspath / subdir`\n4. Copier walks that directory as the template root\n\nRelevant code:\n\n- \u003chttps://github.com/copier-org/copier/blob/7aa7021bd73797c982492bac3535515d4484fdb7/copier/_main.py#L1056-L1062\u003e\n- \u003chttps://github.com/copier-org/copier/blob/7aa7021bd73797c982492bac3535515d4484fdb7/copier/_template.py#L504-L513\u003e\n\nThe effective sink is:\n\n```python\nsubdir = self._render_string(self.template.subdirectory) or \"\"\nreturn self.template.local_abspath / subdir\n```\n\nThere is no check that the resulting path stays inside the template directory.\n\nThe documentation for `_subdirectory` describes it as:\n\n\u003e Subdirectory to use as the template root when generating a project.\n\nand explains it as a way to separate template metadata from template source code:\n\n\u003chttps://github.com/copier-org/copier/blob/7aa7021bd73797c982492bac3535515d4484fdb7/docs/configuring.md#L1582-L1646\u003e\n\nThat description fits values like `template` or `poetry`, but not `..`.\n\n### PoC\n\n#### PoC 1: `_subdirectory: ..` escapes to the parent directory\n\n```sh\nmkdir -p root/template dst\necho \u0027loot\u0027 \u003e root/loot.txt\nprintf \u0027%s\\n\u0027 \u0027_subdirectory: ..\u0027 \u003e root/template/copier.yml\n\ncopier copy --overwrite root/template dst\nfind dst -maxdepth 3 -type f | sort\ncat dst/loot.txt\n```\n\nExpected output includes:\n\n```text\ndst/loot.txt\ndst/template/copier.yml\nloot\n```\n\nThis shows Copier is rendering from `root/` rather than from `root/template/`.\n\n### Impact\n\nIf a user runs Copier on an untrusted template, that template can change the effective template root and make Copier render files from outside the intended template directory.\n\nPractical impact:\n\n- template-root escape via `..`\n- rendering of parent-directory files that were not meant to be part of the template\n- possible without `--UNSAFE`",
  "id": "GHSA-85v3-4m8g-hrh6",
  "modified": "2026-04-06T17:32:29Z",
  "published": "2026-04-01T22:28:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34726"
    },
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/copier-org/copier"
    },
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/releases/tag/v9.14.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Copier `_subdirectory` allows template root escape via parent-directory traversal"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-34726 (GCVE-0-2026-34726)

FKIE_CVE-2026-34726

GHSA-85V3-4M8G-HRH6

Summary

Details

PoC

PoC 1: _subdirectory: .. escapes to the parent directory

Impact

Tags

Sightings

Nomenclature

PoC 1: `_subdirectory: ..` escapes to the parent directory