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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| EGOR | Data::HashMap::Shared | unaffected |
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Vendor Solution
Upgrade to Data::HashMap::Shared 0.14 or later, which bounds the arena offset and length in shm_str_copy before the copy.
Vendor Workaround
For deployments that cannot upgrade to 0.14, place the backing file in a directory writable only by the owning user, so a local peer cannot tamper with the records the iteration paths read.
Tracking
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Tue, 21 Jul 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | 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 | |
| Weaknesses | CWE-125 | |
| References |
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-21T19:03:48.428Z
Reserved: 2026-07-02T16:24:17.912Z
Link: CVE-2026-59142
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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