CVE-2025-8194

Tarfile infinite loop during parsing with negative member offset

At a glance

Severity
HIGH 7.5
EPSS
EPSS 0.71 % · percentile 53 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
PSF
NVD status
Deferred

Description

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

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HPSF
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · cna@python.org (Secondary)

Weaknesses (CWE)

European references

CERT-FR advisories

Affected products

ProductVersions
Python Software Foundation · CPythonaffected 0 < 3.9.24 ; affected 3.10.0 < 3.10.19 ; affected 3.11.0 < 3.11.14 ; affected 3.12.0 < 3.12.12 ; affected 3.13.0 < 3.13.6 ; affected 3.14.0a1 < 3.14.0rc2

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD