CVE-2026-54522 in MessagePack

Resumen

por MITRE • 2026-07-30

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.

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• Responsable: GitHub M
• Reservar: 2026-06-15
• Divulgación: 2026-07-30
• Moderación: aceptado
• Artículo: VDB-384869
• CPE: listo
• CWE: CWE-120 (confirmado)
• CVSS: 5.5 (VulDB)
• EPSS: 0.00000
• KEV: no
• Actividades: bajo

Fuentes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-54522
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54522
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-54522/