{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59144", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-07-02T16:24:17.913Z", "datePublished": "2026-07-21T19:04:20.191Z", "dateUpdated": "2026-07-21T19:04:20.191Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Data-RingBuffer-Shared", "product": "Data::RingBuffer::Shared", "programFiles": ["ring.h"], "programRoutines": [{"name": "ring_read_seq"}], "repo": "https://github.com/vividsnow/perl5-data-ringbuffer-shared", "vendor": "EGOR", "versions": [{"lessThan": "0.04", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Data::RingBuffer::Shared versions before 0.04 for Perl allow a stack buffer overflow via an unvalidated elem_size in ring_read_seq.\n\nThe 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'd segment, copying into a fixed 8-byte destination scalar. An elem_size larger than 8 bytes writes past the destination.\n\nA 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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "description": "CWE-121 Stack-based Buffer Overflow", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-07-21T19:04:20.191Z"}, "references": [{"url": "https://metacpan.org/release/EGOR/Data-RingBuffer-Shared-0.04/diff/EGOR/Data-RingBuffer-Shared-0.03#ring.h"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/EGOR/Data-RingBuffer-Shared-0.04/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to Data::RingBuffer::Shared 0.04 or later, which pins elem_size to the fixed element size of the buffer's registered variant."}], "source": {"discovery": "UNKNOWN"}, "title": "Data::RingBuffer::Shared versions before 0.04 for Perl allow a stack buffer overflow via an unvalidated elem_size in ring_read_seq", "workarounds": [{"lang": "en", "value": "For deployments that cannot upgrade to 0.04, place the backing file in a directory writable only by the owning user, so a local peer cannot tamper with the elem_size the read path trusts."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}}}

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