Vulnerability 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 Score
CRITICAL
Related Weaknesses (CWE)
References
- 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-
FAQ
What is CVE-2026-59139?
CVE-2026-59139 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 check...
How severe is CVE-2026-59139?
CVE-2026-59139 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-59139?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.