CVE-2026-59139
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
Vulnerability in Data::ReqRep::Shared for Perl before version 0.05 allows an out-of-bounds read via an unvalidated arena offset and length. The validator does not check array contents, allowing a local attacker to manipulate the file and read adjacent memory or crash the process.
Risk Assessment
A local attacker can read sensitive data from memory or cause a process crash, potentially leading to information disclosure or denial of service.
Recommendation
Update Data::ReqRep::Shared to version 0.05 or later, which includes proper validation of offset and length.
Original NVD description (English source)
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.