CVE-2025-81947.5HighCWE-835

CVE-2025-8194: Tarfile infinite loop during parsing with negative member offset

Python Software Foundation · CPython

Vendor fix available · Affected: Python Software Foundation CPython · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.8%probability of exploitation in the next 30 days

55th percentile

050100

Higher than 55% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Python Software Foundation · CPythonbefore 3.9.24; from 3.10.0 before 3.10.19; from 3.11.0 before 3.11.14; from 3.12.0 before 3.12.12; from 3.13.0 before 3.13.6; from 3.14.0a1 before 3.14.0rc2

On the Atlas

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Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Loop with Unreachable Exit Condition · Denial of Service
Vendor: Python Software Foundation
Published: July 2025
Band: Unlikely (under 1%), July 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-8194 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

1 more reference is in the CVE record.