CVE-2021-46878

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

An issue was discovered in Treasure Data Fluent Bit 1.7.1, erroneous parsing in flb_pack_msgpack_to_json_format leads to type confusion bug that interprets whatever is on the stack as msgpack maps and arrays, leading to use-after-free. This can be used by an attacker to craft a specially craft file and trick the victim opening it using the affect software, triggering use-after-free and execute arbitrary code on the target system.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-843

Affected software

No affected versions have been published.

Timeline

Published
Apr 11, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-46878: High severity, CVSS 7.8 | Vulnix