CVE-2026-59142
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
Perl module Data::HashMap::Shared before version 0.14 contains an out-of-bounds read vulnerability via unvalidated arena offset and length in shm_str_copy. A local user who can write the backing file can poison records, leading to reading adjacent memory or process crash.
Risk Assessment
Risk of reading sensitive memory data or process crash by a local attacker.
Recommendation
Update the Data::HashMap::Shared module to version 0.14 or later.
Original NVD description (English source)
Data::HashMap::Shared versions before 0.14 for Perl allow an out-of-bounds read via an unvalidated arena offset and length in shm_str_copy. The attach-time validator shm_validate_header checks the header scalars and region layout against the file size, but does not validate the array contents it then trusts. shm_str_copy does memcpy(dst, arena + off, len) with off and len read raw from the mmap'd segment and unbounded, on the each, keys, values, pop, shift, take, swap, drain and cursor paths. The get path bounds off and len separately and is not affected. A local peer that can write the backing file can leave the header valid while poisoning a record's offset and length, so iterating or draining the map copies a file-controlled offset and length out of the arena, reading adjacent memory or crashing the process.