Arbitrary file upload in GNU Tar
CVE-2026-5704
A flaw was found in tar. A remote attacker could exploit this vulnerability by crafting a malicious archive, leading to hidden file injection with fully attacker-controlled content. This bypasses pre-extraction inspection mechanisms, potentially allowing an attacker to introduce malicious files onto a system without detection.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-5704 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Exploit, Third Party Advisory, Issue Tracking)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2026:61581 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61783 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61586 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:66018 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:66514 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-5704?
- CVE-2026-5704 is a medium-severity vulnerability in GNU Tar, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.0/10. Published 2026-04-06.
- How severe is CVE-2026-5704?
- Medium severity. CVSS v3 base score is 5.0 out of 10.