# 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. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 25 Jun 2026 - **Updated:** 25 Jun 2026 - **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, openSUSE-SU-2026:11179-1, openSUSE-SU-2026:21218-1 ## 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. Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow) ## Which versions are affected by CVE-2026-12844? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `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. ## Is CVE-2026-12844 being exploited? There is no known exploitation of CVE-2026-12844 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-12844 and fix it if it is affected. What it is: 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. Exploitation: There is no known exploitation of CVE-2026-12844 in the wild and no public exploit code. Affected product: DROLSKY List::SomeUtils::XS. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-12844/ (Markdown: https://insights.sbomify.com/CVE-2026-12844/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12844 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12844 - OSV: https://osv.dev/vulnerability/CVE-2026-12844 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-12844/ Summaries are generated and may contain mistakes; the official description above is the record.