Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled entry size field in tar header

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-9538
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-26 02:16:41 UTC
Updated2026-05-28 14:16:26 UTC
DescriptionArchive::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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000170000 probability, percentile 0.043160000 (date 2026-05-27)

Problem Types: CWE-789 | CWE-789 CWE-789 Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Archive tar_project archive\ \ tar

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA BINGOS ArchiveTar affected 3.10 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/BINGOS/Archive-Tar-3.10/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
github.com/jib/archive-tar-new/commit/f9af01426038e29d9578825a0cd3626946... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
www.openwall.com/lists/oss-security/2026/05/26/4 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-25T00:00:00.000ZIssue reported.
CNA2026-05-25T00:00:00.000ZVersion 3.10 released.

Solutions

CNA: Upgrade to Archive::Tar 3.10 or later.

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