Buffer overflow in Drolsky List::someutils::xs
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Drolsky List::someutils::xs — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-12844?
- CVE-2026-12844 is a high-severity vulnerability in Drolsky List::someutils::xs, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-06-25.
- How severe is CVE-2026-12844?
- High severity. CVSS v3 base score is 7.5 out of 10.