EGOR Data::ReqRep::Shared up to 0.4 reqrep.h reqrep_recv_locked arena_off/len out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, was found in EGOR Data::ReqRep::Shared up to 0.4. This affects the function reqrep_recv_locked of the file reqrep.h. Such manipulation of the argument arena_off/len leads to out-of-bounds. This vulnerability is documented as CVE-2026-59139. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in EGOR Data::ReqRep::Shared up to 0.4. Affected by this issue is the function reqrep_recv_locked of the file reqrep.h. The manipulation of the argument arena_off/len with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at metacpan.org. This vulnerability is handled as CVE-2026-59139 since 07/02/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 0.05 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• EGOR

Name

• Data::ReqRep::Shared

Version

• 0.1
• 0.2
• 0.3
• 0.4

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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