CVE-2026-12844

List::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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/houseabsolute/List-SomeUtils-XS/commit/22549f78669b780d6aa338a2d2e49a3dedfffaa6.patch
https://metacpan.org/release/DROLSKY/List-SomeUtils-XS-0.59/changes
http://www.openwall.com/lists/oss-security/2026/06/25/11

Configurations

No configuration.

History

25 Jun 2026, 20:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
References		() http://www.openwall.com/lists/oss-security/2026/06/25/11 -

25 Jun 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-25 16:16

Updated : 2026-06-25 20:17

NVD link : CVE-2026-12844

Mitre link : CVE-2026-12844

CVE.ORG link : CVE-2026-12844

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

CWE-787

Out-of-bounds Write

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