Review reviewHigh

CVE-2025-8194

Python Software Foundation CPython

There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

CVSS: 7.5
EPSS: 0.61%
CISA KEV: Not listed
Published: 2025.07.29

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.61%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Python Software Foundation CPython
Affected versions: < 3.9.24, >= 3.10.0 < 3.10.19, >= 3.11.0 < 3.11.14, >= 3.12.0 < 3.12.12, >= 3.13.0 < 3.13.6, >= 3.14.0a1 < 3.14.0rc2
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Python Software Foundation CPython and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-835