PT-2026-43166 · Cpan · Archive Tar

Stig Palmquist · Published 2026-05-26 · Updated 2026-06-25 · CVE-2026-9538

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Archive::Tar versions prior to 3.10

Description Archive::Tar for Perl allows memory exhaustion when processing a tar header with an attacker-controlled entry size field. The read tar() function reads each entry's payload using $handle->read($$data, $block), where the $block variable is derived from the 12-byte size field in the tar header without an upper bound. A crafted header specifying a multi-gigabyte size forces Perl to allocate a scalar of that size, leading to memory exhaustion.

Recommendations Update to version 3.10 or later.

Exploit

Fix

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-9538

ECHO-E379-3651-BF29

Affected Products

Archive Tar

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9538.json · Exploit
• https://github.com/jib/archive-tar-new/commit/f9af01426038e29d9578825a0cd3626946ab08c7.patch · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-9538 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-9538 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-9538 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-9538 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2026-9538 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-9538 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-9538 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2026-9538 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-9538 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-9538 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-9538 · Vendor Advisory
• https://github.com/jib/archive-tar-new · Note
• http://openwall.com/lists/oss-security/2026/05/26/4 · Note