CVE-2026-34726

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Source
https://cve.org/CVERecord?id=CVE-2026-34726
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34726.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34726
Aliases
Published
2026-04-02T18:07:35Z
Modified
2026-10-28T02:30:49Z
Severity
  • 4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Copier `_subdirectory` allows template root escape via parent-directory traversal
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34726.json"
}
References

Affected packages

Git / github.com/copier-org/copier

Affected ranges

Type
GIT
Repo
https://github.com/copier-org/copier
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f6ac94689a0a672ae1a53d442740fb85dbd4004f
Fixed
cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:copier-org:copier:*:*:*:*:*:python:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "9.14.1"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v9.14.1",
            "range": [
                {
                    "fixed": "f6ac94689a0a672ae1a53d442740fb85dbd4004f"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

1.*
1.1.1
3.*
3.0.0-alpha5
3.0.0-alpha6
v2.*
v2.2.3
v2.3
v2.3.1
v2.3.2
v2.3.3
v2.4.0
v2.4.1
v2.4.2
v2.5.0
v2.5.1
v3.*
v3.0.0
v3.0.0-alpha1
v3.0.0-alpha2
v3.0.0-alpha3
v3.0.0-alpha4
v3.0.0-alpha7
v3.0.0-alpha8
v3.0.0-beta1
v3.0.1
v3.0.2
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.1.0
v3.2.0
v4.*
v4.0.0
v4.0.1
v4.0.2
v4.1.0
v5.*
v5.0.0
v5.1.0
v6.*
v6.0.0
v6.0.0a0
v6.0.0a1
v6.0.0a2
v6.0.0a3
v6.0.0a4
v6.0.0a5
v6.0.0a6
v6.0.0a7
v6.0.0a8
v6.0.0a9
v6.0.0b0
v6.1.0
v6.2.0
v7.*
v7.0.1
v7.1.0
v7.1.0a0
v7.2.0
v8.*
v8.0.0
v8.1.0
v8.2.0
v8.3.0
v9.*
v9.0.0
v9.0.1
v9.1.1
v9.10.0
v9.10.1
v9.10.2
v9.10.3
v9.11.0
v9.11.1
v9.11.2
v9.11.3
v9.12.0
v9.13.0
v9.13.1
v9.14.0
v9.2.0
v9.3.0
v9.3.1
v9.4.0
v9.4.1
v9.5.0
v9.6.0
v9.7.0
v9.7.1
v9.8.0
v9.9.0
v9.9.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34726.json"