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NVD description
Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter for more information. Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected. Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-06-25 | 1 | Disclosure1 |
| 2026-06-28 | 1 | General1 |
ただし NVD では CVSS 4.0 ベーススコア 7.8 の高深刻度として扱われています。 過去の CVE-2025-4330 の修正が不完全だったことが、今回の背景にあるとされています。 寸評：正直に言って、未実害でも「安全」とは別問題です
Post summary
The post notes that NVD rates the vulnerability as high severity (CVSS 4.0 score 7.8) due to an incomplete fix of a previous CVE, emphasizing that lack of actual harm does not equal safety. No exploitation or patch details are provided.
CVE-2026-11940: CPython: tarfile extraction filter bypass allows escaping the destination directory https://www.openwall.com/lists/oss-security/2026/06/23/6 by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. This was an incomplete fix of CVE-2025-4330.
Post summary
The text discloses a CPython tarfile extraction filter bypass vulnerability (CVE-2026-11940), detailing its technical mechanism but not providing PoC, exploit code, or patch information.