CVE-2021-46878
Last modified
CVE-2021-46878 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
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/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Treasuredata | Fluent Bit | 1.7.1 |
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27742Exploit, Issue Tracking, Patch, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27742Exploit, Issue Tracking, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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