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Vulnerability record · CVE-2026-59139 · published 21 July 2026

CVE-2026-59139: Out-of-bounds read vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.54% · top 56.9% 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::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.

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-ReqRep-Shared-0.05/changes
https://metacpan.org/release/EGOR/Data-ReqRep-Shared-0.05/diff/EGOR/Data-ReqRep-Shared-0.04#reqrep.h

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Source: NIST National Vulnerability Database (record CVE-2026-59139), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.