Bug 2481315 (CVE-2026-9538)

Summary:	CVE-2026-9538 perl-Archive-Tar: perl-Archive-Tar: Denial of Service via crafted tar header with large entry size
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the perl-Archive-Tar component. An attacker can exploit this vulnerability by providing a crafted tar header with an excessively large entry size field. This can lead to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2496665
Bug Blocks:

Description OSIDB Bzimport 2026-05-26 02:01:17 UTC

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.

Comment 3 errata-xmlrpc 2026-07-29 23:07:31 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:48225 https://access.redhat.com/errata/RHSA-2026:48225

Comment 4 errata-xmlrpc 2026-08-03 03:06:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:49524 https://access.redhat.com/errata/RHSA-2026:49524

Comment 5 errata-xmlrpc 2026-08-03 03:53:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:49525 https://access.redhat.com/errata/RHSA-2026:49525

Comment 6 errata-xmlrpc 2026-08-03 04:11:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:49523 https://access.redhat.com/errata/RHSA-2026:49523