Answer in brief
CVE-2026-11940 records a High severity (CVSS 7.8) vulnerability in tarfile extraction filter bypass allows escaping the destination directory. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Python Software Foundation/CPythongeneric | >=0 <3.15.0b4 | 3.15.0b4 |
| Python Software Foundation/CPythongeneric | >=0 <3.14.7 || >=3.15.0a1 <3.15.0b4 | 3.14.7, 3.15.0b4 |
| Python Software Foundation/CPythongeneric | >=0 <3.13.15 || >=3.14.0 <3.14.7 || >=3.15.0a1 <3.15.0b4 | 3.13.15, 3.14.7, 3.15.0b4 |
| Python Software Foundation/CPythongeneric | >=0 <3.10.21 || >=3.11.0 <3.11.16 || >=3.12.0 <3.12.14 || >=3.13.0 <3.13.15 || >=3.14.0 <3.14.7 || >=3.15.0a1 <3.15.0b4 | 3.10.21, 3.11.16, 3.12.14, 3.13.15, 3.14.7, 3.15.0b4 |
Published upstream
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.
Quoted source text, attributed separately from HOL analysis.