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Vulnerability record · CVE-2026-59142 · published 21 July 2026

CVE-2026-59142: Out-of-bounds read vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.54% · top 57.0% CWE-125 · Out-of-bounds read Deferred
9.1CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
22 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

LinkTags
https://metacpan.org/release/EGOR/Data-HashMap-Shared-0.14/changes
https://metacpan.org/release/EGOR/Data-HashMap-Shared-0.14/diff/EGOR/Data-HashMap-Shared-0.13#shm_generic.h

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Source: NIST National Vulnerability Database (record CVE-2026-59142), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.