This vulnerability in Perl (CVE-2026-8376) involves an integer overflow during the calculation of buffer size when compiling regular expressions containing repeated fixed strings on 32-bit builds up to version 5.43.10. The integer overflow leads to allocation of an undersized heap buffer, which is then overflowed by out-of-bounds writes, causing memory corruption. The issue is classified under CWE-680 (Integer Overflow to Buffer Overflow). The CVSS 3.1 base score is 7.3, indicating high severity. There is no confirmed patch or official remediation available at this time, and no known exploits have been reported in the wild.

Successful exploitation can lead to memory corruption on affected 32-bit Perl builds, potentially causing denial of service or other impacts related to corrupted memory. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector (C:L/I:L/A:L). However, no active exploitation has been observed.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when processing untrusted regular expressions with repeated fixed strings on 32-bit Perl builds up to version 5.43.10.