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Vulnerability record · CVE-2026-5704 · published 6 April 2026

CVE-2026-5704: Gnu tar unrestricted file upload vulnerability

Gnu · Tar

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.

5.5 CVSS 3.1 Medium EPSS 0.40% · top 68.2% CWE-434 · Unrestricted file upload
5.5CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
11References, 3 tagged exploit
22 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:61581
https://access.redhat.com/errata/RHSA-2026:61586
https://access.redhat.com/errata/RHSA-2026:61783
https://access.redhat.com/errata/RHSA-2026:66018
https://access.redhat.com/errata/RHSA-2026:66514
https://access.redhat.com/errata/RHSA-2026:70390
https://access.redhat.com/security/cve/CVE-2026-5704 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455360 ExploitIssue TrackingThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/04/11/10 ExploitMailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/04/11/11 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/04/12/2 ExploitMailing ListThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-5704), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.