Medium
python-dotenv — security advisory
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.
- Products
- python-dotenv
- Affected versions
- 0.15.0-1, 0.19.0-1, 0.19.2-1, 0.7.1-1.1, 0.9.1-1, 1.0.0-1, 1.0.1-1, 1.0.1-1build1, 1.2.1-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-28684
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:06 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-28684
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
python-dotenv
Fixed versions: Not specified
Complete source record
{
"id": "d67cb4a02217437aa17047633edc329e4c0d13b1ded3e53f17aac8126683793b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-28684",
"method": "structured",
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"title": "UBUNTU-CVE-2026-28684",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-28684",
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"modified": "2026-10-17T12:58:08.103490576Z",
"provider": "osv",
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-28684",
"https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94"
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"source_id": "core-osv",
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"published_at": "2026-04-20T17:16:00+00:00"
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