ubuntu-cve-2026-28684
Vulnerability from osv_ubuntu
Published
2026-04-20 17:16
Modified
2026-05-20 15:26
Summary
Details
python-dotenv reads key-value pairs from a .env file and can set them as environment variables. Prior to version 1.2.2, set_key() and unset_key() in python-dotenv follow symbolic links when rewriting .env files, allowing a local attacker to overwrite arbitrary files via a crafted symlink when a cross-device rename fallback is triggered. Users should upgrade to v.1.2.2 or, as a workaround, apply the patch manually.
Severity
6.6 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "0.7.1-1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@0.7.1-1.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.7.1-1.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "0.9.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@0.9.1-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "0.19.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@0.19.2-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.15.0-1",
"0.19.0-1",
"0.19.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "1.0.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@1.0.1-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0-1",
"1.0.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "1.0.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@1.0.1-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-dotenv",
"binary_version": "1.0.1-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-dotenv",
"purl": "pkg:deb/ubuntu/python-dotenv@1.0.1-1build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-1",
"1.0.1-1build1"
]
}
],
"aliases": [],
"details": "python-dotenv reads key-value pairs from a .env file and can set them as environment variables. Prior to version 1.2.2, `set_key()` and `unset_key()` in python-dotenv follow symbolic links when rewriting `.env` files, allowing a local attacker to overwrite arbitrary files via a crafted symlink when a cross-device rename fallback is triggered. Users should upgrade to v.1.2.2 or, as a workaround, apply the patch manually.",
"id": "UBUNTU-CVE-2026-28684",
"modified": "2026-05-20T15:26:07Z",
"published": "2026-04-20T17:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-28684"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-28684"
},
{
"type": "REPORT",
"url": "https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-28684"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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