CVE-2025-4138

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2025-06-03. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata.

You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information.

Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected.

Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
63.4%
KEV
Not listed

Published

June 3, 2025

Last Modified

April 15, 2026

References (12)

Vendor Advisories for CVE-2025-4138(17)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3.13-venv (3.13.3-1ubuntu0.2) @ plucky2026-05-21ubuntu
redhatopenshift-serverless-1/logic-swf-devmode-rhel8:1.36.0-72026-01-22redhat
redhatpython39-devel:3.9-8100020251126112422.d47b87a42025-12-18redhat
redhatcert-manager/jetstack-cert-manager-rhel9:v1.16.5-17605157572025-10-16redhat
redhatdiscovery/discovery-server-rhel9:2.0.1-17544787272025-08-06redhat
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17520657552025-07-17redhat
redhatpython3-0:3.6.8-51.el8_8.102025-07-08redhat
redhatpython3.9-0:3.9.18-3.el9_4.82025-07-07redhat
redhatpython3-0:3.6.8-47.el8_6.82025-07-07redhat
redhatpython3.12-0:3.12.9-1.el9_6.12025-07-02redhat
redhatpython3-0:3.6.8-70.el8_102025-07-01redhat
redhatpython3.12-0:3.12.1-4.el9_4.62025-07-01redhat
redhatpython3.11-0:3.11.11-2.el9_6.12025-07-01redhat
redhatpython3.9-0:3.9.21-2.el9_6.12025-07-01redhat
redhatpython3.11-0:3.11.13-1.el8_102025-07-01redhat
redhatpython3.12-0:3.12.9-2.el10_0.22025-07-01redhat
redhatpython3.12-0:3.12.11-1.el8_102025-07-01redhat
redhatpython3.11-0:3.11.7-1.el9_4.82025-06-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

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Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCDesertDemons/CVE-2025-4138-4517-POC
    First seen Feb 15, 2026

    CVE-2025-4138 / CVE-2025-4517 — Python tarfile PATH_MAX Symlink Filter Bypass

    Open source ↗
  • GitHub PoCthefizzyfish/CVE-2025-4138_tarfile_filter_bypass
    First seen Feb 15, 2026

    CVE-2025-4138 - Python Arbitrary file write outside extraction directory

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-4138?
CVE-2025-4138 is a high vulnerability published on June 3, 2025. Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or…
When was CVE-2025-4138 disclosed?
CVE-2025-4138 was first published in the National Vulnerability Database on June 3, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-4138 actively exploited?
CVE-2025-4138 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-4138?
CVE-2025-4138 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2025-4138?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-4138, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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