Security · High impactFan score 65 · Tier A2 sources

Patch verification for CVE-2025-4517 in containers and dependencies

DEV · By Ioneyrezende · 4h ago

The Brief

CVE-2025-4517 is a Python tarfile path validation flaw rated critical in the sources.
A crafted archive can write files outside the extraction directory when an application uses filter="data" or filter="tar".
The flaw can bypass the intended path boundary even when application code uses those tar filters.

Why it matters

Services that extract tar archives from untrusted sources may be exposed to arbitrary file writes, so checking only one Python interpreter may leave other deployed copies vulnerable.

Who’s affected

Teams running Python tar extraction on archives they do not fully control
Operators of containers and dependencies that bundle Python

What to do

Verify that the patch is applied in containers and dependencies, not only in one interpreter
Review archive-handling services that use filter="data" or filter="tar" as part of incident response

CVE-2025-4517
#python
#security
#cve
#tarfile
#path-traversal
#incident-response

Patch verification for CVE-2025-4517 in containers and dependencies Why checking one interpreter is not enough CVE-2025-4517 is a critical arbitrary-file-write flaw in Python tar extraction. It can bypass the intended path boundary even when application code uses the data or tar…

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