VULNERABILITY INTELLIGENCE

CVE-2021-46878

CVSS score7.8 HIGH

EPSS probability0.35%

CISA KEVNot currently listed

Published2023-04-11

Last modified2026-06-17

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

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.

Weakness classification

CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

Primary references

cve@mitre.org — Exploit, Issue Tracking, Patch, Third Party Advisory
cve@mitre.org — Patch
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch