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Fencer Vulns
high 7.5

CVE-2026-12844 json

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

published 2026-06-25 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-39444

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • DROLSKY List::SomeUtils::XS 0.59
  • liblist-someutils-xs-perl Debian 14 0.59-1

debian advisories DEBIAN-CVE-2026-12844

  • perl-List-SomeUtils-XS SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 0.56-150000.3.3.1
  • perl-List-SomeUtils-XS SLES for SAP applications 16.0, SLES 16.0 0.58-160000.3.2

suse advisories SUSE-SU-2026:2845-1SUSE-SU-2026:22559-1

  • perl-List-SomeUtils-XS openSUSE Leap 16.0 0.58-160000.3.2
  • perl-List-SomeUtils-XS openSUSE Tumbleweed 0.590.0-1.1

opensuse advisories openSUSE-SU-2026:21218-1openSUSE-SU-2026:11179-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12844 updated cvss 7.8

perl-List-SomeUtils-XS: List::SomeUtils::XS: Heap buffer overflow in pairwise() function leading to arbitrary code execution

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • DROLSKY List::SomeUtils::XS

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.