CVE-2026-12844 List::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function
A heap buffer overflow in the pairwise function allows attackers to corrupt memory, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-12844?
CVE-2026-12844 is a high-severity memory corruption vulnerability in DROLSKY List::SomeUtils::XS, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-12844?
Linux distribution packages (15)
perl-List-SomeUtils-XS SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server 16.0 | All versions | 0.58-160000.3.2 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 0.56-150000.3.3.1 |
perl-List-SomeUtils-XS SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 0.58-160000.3.2 |
perl-List-SomeUtils-XS openSUSE:Leap 16.0 | All versions | 0.58-160000.3.2 |
perl-List-SomeUtils-XS openSUSE:Tumbleweed | All versions | 0.590.0-1.1 |
How do I fix CVE-2026-12844?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-12844 being exploited?
There is no known exploitation of CVE-2026-12844 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-12844, GHSA-h2pv-qmv8-hvcv, MGASA-2026-0244, SUSE-SU-2026:22559-1, SUSE-SU-2026:2845-1, UBUNTU-CVE-2026-12844 and 2 more.