PT-2026-30666 · Gnu · Gnu Tar

Guillermo De Angel Garcia · Published 2026-04-06 · Updated 2026-06-02 · CVE-2026-5704

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions GNU tar (affected versions not specified)

Description A flaw exists in GNU tar that allows a remote attacker to craft 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. The issue arises because the -t (list) and -x (extract) options produce different results when processing archives containing non-data-bearing typeflags (symlink, chardev, blockdev, FIFO) with a non-zero size field.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-5704

ECHO-6544-7E09-569C

Affected Products

Gnu Tar

References · 17

• 🔥 https://bugzilla.redhat.com/show_bug.cgi?id=2455360 · Exploit
• 🔥 http://openwall.com/lists/oss-security/2026/04/11/10 · Exploit
• 🔥 http://openwall.com/lists/oss-security/2026/04/12/2 · Exploit
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2026-5704 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-5704 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5704 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5704 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5704 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-5704 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5704 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-5704 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2026-5704 · Vendor Advisory
• https://twitter.com/threatcluster/status/2061858627963515285 · Twitter Post
• http://openwall.com/lists/oss-security/2026/04/11/11 · Note
• https://twitter.com/oss_security/status/2043015497424220223 · Twitter Post