CVE-2026-9538

CVE Details

Release Date:	2026-05-26
Impact:	Important	What is this?

Description

Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled entry size field in tar header. _read_tar() reads each entry's payload with $handle->read($$data, $block), where $block is derived from the entry's 12-byte size field in the tar header with no upper bound on that value. A crafted header declaring a multi-gigabyte size causes Perl to allocate a scalar of that size.

See more information about CVE-2026-9538 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.5
Vector String:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (perl-Archive-Tar)	ELSA-2026-49523	2026-08-03
Oracle Linux version 8 (perl-Archive-Tar)	ELSA-2026-49524	2026-08-03
Oracle Linux version 9 (perl-Archive-Tar)	ELSA-2026-49525	2026-08-03