CVE-2026-102938

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Source
https://cve.org/CVERecord?id=CVE-2026-102938
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-102938.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-102938
Aliases
Downstream
Published
2026-09-29T20:58:20Z
Modified
2026-10-01T03:47:45Z
Severity
  • 5.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowing configuration injection
Details

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.11, PyEnvCfg.write() writes prompt values verbatim to the line-oriented pyvenv.cfg format while PyEnvCfg._read_values() parses the file with str.splitlines() and accepts the last value for duplicate keys. An attacker who influences --prompt, VIRTUALENV_PROMPT, or configuration input can insert a recognized line boundary and additional keys, including home, causing consumers to use an attacker-selected base interpreter or corrupted environment metadata. The security impact requires prompt input from outside the operator's trust boundary; directly supplied prompt content primarily corrupts the operator's own environment. This issue is fixed in version 21.7.11.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-93"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102938.json"
}
References

Affected packages

Git / github.com/pypa/virtualenv

Affected ranges

Type
GIT
Repo
https://github.com/pypa/virtualenv
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a30f995461043acb6cacbf3a890951563ccf7140
Fixed
73e352ae02bfa52ffc0e307b04f1b6a7168c4eb0
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "21.7.11"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

20.*
20.0.0b1
20.0.0b2
20.0.32
20.0.7
20.24.3
20.27.2
20.27.3
20.3.0
20.37.0
20.38.0
20.39.0
20.39.1
21.*
21.0.0
21.1.0
21.2.0
21.2.1
21.2.2
21.2.3
21.2.4
21.3.0
21.3.1
21.3.2
21.3.3
21.4.0
21.4.1
21.4.2
21.4.3
21.5.0
21.5.1
21.5.2
21.6.0
21.6.1
21.7.0
21.7.1
21.7.10
21.7.2
21.7.3
21.7.4
21.7.5
21.7.6
21.7.7
21.7.8
21.7.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-102938.json"