CVE-2026-59139
N/A
Summary
Data::ReqRep::Shared versions before 0.05 for Perl allow an out-of-bounds read via an unvalidated arena offset and length in reqrep_recv_locked.
The attach-time validator reqrep_validate_header checks the header scalars and region layout against the file size, but does not validate the array contents it then trusts. reqrep_recv_locked does memcpy(copy_buf, req_arena + arena_off, len) with arena_off and len read raw from the mmap'd segment and never bounded against the arena capacity (req_arena_cap).
A local peer that can write the backing file can leave the header valid while poisoning a request slot's offset and length, so receiving the request copies a file-controlled offset and length out of the arena, reading adjacent memory or crashing the process.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| EGOR | Data::ReqRep::Shared | 0 < 0.05 | affected |
Weaknesses
- CWE-125: CWE-125 Out-of-bounds Read
Workarounds
For deployments that cannot upgrade to 0.05, place the backing file in a directory writable only by the owning user, so a local peer cannot tamper with the segment contents the read path trusts.
References
- https://metacpan.org/release/EGOR/Data-ReqRep-Shared-0.05/diff/EGOR/Data-ReqRep-Shared-0.04#reqrep.h
- https://metacpan.org/release/EGOR/Data-ReqRep-Shared-0.05/changes
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