High
python-virtualenv — security advisory
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, BatchActivator.quote() returns prompt text unchanged before activate.bat inserts it into a cmd.exe set "VAR=value" statement. An attacker who influences --prompt, VIRTUALENV_PROMPT, or the corresponding configuration value can include a double quote that closes the assignment and leaves following cmd.exe operators as executable syntax. When a user activates the generated Windows environment, the injected commands run with that user's privileges. This issue is fixed in version 21.7.12.
- Products
- python-virtualenv
- Affected versions
- 1.10.1-1, 1.11-1, 1.11-2, 1.11.4-1, 1.11.4-1ubuntu1, 1.11.6+ds-1, 14.0.5+ds-1, 14.0.5+ds-2, 14.0.5+ds-4, 15.0.0+ds-1, 15.0.0+ds-2, 15.0.1+ds-1, 15.0.1+ds-2, 15.0.1+ds-3, 15.0.1+ds-3ubuntu1, 15.0.1+ds-3ubuntu1.1, 15.1.0+ds-1, 15.1.0+ds-1.1, 15.1.0+ds-2, 15.1.0+ds-2build1, 15.1.0+ds-2ubuntu1, 20.0.13-1, 20.0.17-1, 20.0.17-1ubuntu0.3, 20.0.17-1ubuntu0.4, 20.0.17-1ubuntu0.4+esm1, 20.10.0+ds-1, 20.12.1+ds-1, 20.13.0+ds-1, 20.13.0+ds-2, 20.13.0+ds-2ubuntu0.1~esm1, 20.24.1+ds-1, 20.24.6+ds-1, 20.24.6+ds-2, 20.25.0+ds-1, 20.25.0+ds-2, 20.25.0+ds-2ubuntu0.1~esm1, 20.31.2+ds-1, 20.35.3+ds-1, 20.35.4+ds-1, 20.36.1+ds-1, 20.4.6+ds-2, 21.4.1+ds-1, 21.5.1+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102937
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:57 UTC · Revision 1
Source evidence
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, BatchActivator.quote() returns prompt text unchanged before activate.bat inserts it into a cmd.exe set "VAR=value" statement. An attacker who influences --prompt, VIRTUALENV_PROMPT, or the corresponding configuration value can include a double quote that closes the assignment and leaves following cmd.exe operators as executable syntax. When a user activates the generated Windows environment, the injected commands run with that user's privileges. This issue is fixed in version 21.7.12.
osv:UBUNTU-CVE-2026-102937
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
python-virtualenv
Fixed versions: Not specified
Complete source record
{
"id": "03799bade0b484caf2a20dce188b2e3d6ceefa04edef1d2139783511af48e2cd",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-102937",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-102937",
"summary": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, BatchActivator.quote() returns prompt text unchanged before activate.bat inserts it into a cmd.exe set \"VAR=value\" statement. An attacker who influences --prompt, VIRTUALENV_PROMPT, or the corresponding configuration value can include a double quote that closes the assignment and leaves following cmd.exe operators as executable syntax. When a user activates the generated Windows environment, the injected commands run with that user's privileges. This issue is fixed in version 21.7.12.",
"evidence": "osv:UBUNTU-CVE-2026-102937",
"products": [
{
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},
{
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"evidence": "/affected/0/versions"
},
{
"value": "1.11-2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/4/versions"
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{
"value": "20.12.1+ds-1",
"evidence": "/affected/4/versions"
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{
"value": "20.13.0+ds-1",
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{
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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{
"name": {
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"evidence": "/affected/6/package/name"
},
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"affected_versions": [
{
"value": "20.36.1+ds-1",
"evidence": "/affected/6/versions"
},
{
"value": "21.4.1+ds-1",
"evidence": "/affected/6/versions"
},
{
"value": "21.5.1+ds-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "python-virtualenv",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "20.31.2+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "20.35.3+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "20.35.4+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "20.36.1+ds-1",
"evidence": "/affected/7/versions"
}
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}
],
"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"1.11-1",
"1.11-2",
"1.11.4-1",
"1.11.4-1ubuntu1"
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"15.0.0+ds-2",
"15.0.1+ds-1",
"15.0.1+ds-2",
"15.0.1+ds-3",
"15.0.1+ds-3ubuntu1",
"15.0.1+ds-3ubuntu1.1"
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"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
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{
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],
"modified": "2026-10-17T12:57:57.409138602Z",
"provider": "osv",
"upstream": [
"CVE-2026-102937"
],
"references": [
"https://ubuntu.com/security/CVE-2026-102937",
"https://www.cve.org/CVERecord?id=CVE-2026-102937",
"https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6",
"https://github.com/pypa/virtualenv/pull/3250",
"https://github.com/pypa/virtualenv/releases/tag/21.7.12",
"https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q"
]
},
"related_cves": [
{
"value": "CVE-2026-102937",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 357777,
"published_at": "2026-09-29T21:17:00+00:00"
}