Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/houseabsolute/List-SomeUtils-XS/commit/22549f78669b780d6aa338
- https://metacpan.org/release/DROLSKY/List-SomeUtils-XS-0.59/changes
- http://www.openwall.com/lists/oss-security/2026/06/25/11
FAQ
What is CVE-2026-12844?
CVE-2026-12844 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 inp...
How severe is CVE-2026-12844?
CVE-2026-12844 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12844?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.