HighFix available
ansible, ansible-core — security advisory
A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.
- Products
- ansible, ansible-core
- Affected versions
- Not specified
- Fixed versions
- 2.12.0-1, 5.4.0-1
- CVEs
- CVE-2021-3583
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:36 UTC · Revision 1
Source evidence
A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.
osv:DEBIAN-CVE-2021-3583
ansible
Fixed versions: 5.4.0-1
ansible
Fixed versions: 5.4.0-1
ansible
Fixed versions: 5.4.0-1
ansible-core
Fixed versions: 2.12.0-1
ansible-core
Fixed versions: 2.12.0-1
ansible-core
Fixed versions: 2.12.0-1
Complete source record
{
"id": "6c171c444998e4434fdcf719d98d35eb5d6e9781092676a057ea25ddac3bd322",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-3583",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-3583",
"summary": "A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.",
"evidence": "osv:DEBIAN-CVE-2021-3583",
"products": [
{
"name": {
"value": "ansible",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.4.0-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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{
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{
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{
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{
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],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2021-3583",
"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
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],
"package": {
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"purl": "pkg:deb/debian/ansible?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3583.json"
},
"ecosystem_specific": {
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{
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"package": {
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"database_specific": {
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{
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"package": {
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"ecosystem": "Debian:14"
},
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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"package": {
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"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3583.json"
},
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}
},
{
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],
"package": {
"name": "ansible-core",
"purl": "pkg:deb/debian/ansible-core?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3583.json"
},
"ecosystem_specific": {
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}
},
{
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{
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{
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],
"package": {
"name": "ansible-core",
"purl": "pkg:deb/debian/ansible-core?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3583.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:03:29.607808174Z",
"provider": "osv",
"upstream": [
"CVE-2021-3583"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-3583"
]
},
"related_cves": [
{
"value": "CVE-2021-3583",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 421682,
"published_at": "2021-09-22T12:15:07.953+00:00"
}