PT-2026-62045 · Egor · Data::Hashmap::Shared
CVE-2026-59142
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Published
2026-07-21
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Updated
2026-07-21
None
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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.
Out of bounds Read
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Weakness Enumeration
Related Identifiers
Affected Products
Data::Hashmap::Shared