List::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-12844
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 16:16:33 UTC
Updated2026-06-25 20:17:10 UTC
DescriptionList::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function. pairwise() collects the values returned by the block into a heap buffer sized to the longer input array, then grows the buffer before each copy with a single quadrupling (alloc <<= 2) instead of a loop. A block call that returns more than four times the current allocation in one invocation outgrows that one quadrupling, and the copy writes past the end of the buffer. Any caller of pairwise() whose block returns, for a single pair, more than four times the longer input array's length writes past the buffer and corrupts the heap.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.004190000 probability, percentile 0.336030000 (date 2026-06-29)

Problem Types: CWE-122 | CWE-787 | CWE-787 CWE-787 Out-of-bounds Write | CWE-122 CWE-122 Heap-based Buffer Overflow

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA DROLSKY ListSomeUtilsXS affected 0.59 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/06/25/11 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/DROLSKY/List-SomeUtils-XS-0.59/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/houseabsolute/List-SomeUtils-XS/commit/22549f78669b780d6aa338... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to List::SomeUtils::XS 0.59 or later.

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