CVE-2026-59144
Severity CVSS v4.0:
Pending analysis
Type:
CWE-121
Stack-based Buffer Overflow
Publication date:
21/07/2026
Last modified:
22/07/2026
Description
Data::RingBuffer::Shared versions before 0.04 for Perl allow a stack buffer overflow via an unvalidated elem_size in ring_read_seq.<br />
<br />
The attach-time validator ring_validate_header checks the capacity-overflow and total_size consistency of the header but never caps elem_size against the destination size. ring_read_seq does memcpy(out, ring_slot(h, seq), elem_size) with elem_size read raw from the mmap&#39;d segment, copying into a fixed 8-byte destination scalar. An elem_size larger than 8 bytes writes past the destination.<br />
<br />
A local peer that can write the backing file can leave the header valid while setting a large elem_size, so the next read copies a file-controlled length into the fixed 8-byte stack buffer, corrupting adjacent stack frames.
Impact
Base Score 3.x
9.80
Severity 3.x
CRITICAL