CVE-2026-28684— python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback
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I. Basic Information for CVE-2026-28684
Vulnerability Information
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Vulnerability Title
python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: NVD (National Vulnerability Database)
Vulnerability Title
python-dotenv 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
python-dotenv是Saurabh Kumar个人开发者的一个Python环境变量管理工具。 python-dotenv 1.2.2之前版本存在安全漏洞，该漏洞源于set_key和unset_key函数在处理符号链接时存在缺陷，可能导致本地攻击者通过特制的符号链接覆盖任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| theskumar | python-dotenv | < 1.2.2 | - |
II. Public POCs for CVE-2026-28684
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release v1.2.2 · theskumar/python-dotenv · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-28684
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V. Comments for CVE-2026-28684
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