CVE-2021-36088
CRITICALCVSS 9.8/10EPSS 2.38%
Last modified
CVE-2021-36088 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).. EPSS estimates a 2.38% chance of exploitation in the next 30 days.
Description
Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Treasuredata | Fluent Bit | >= 1.7.0, <= 1.7.4 |
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750Exploit, Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3453Patch, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750Exploit, Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3453Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36088?
Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).
How severe is CVE-2021-36088?
CVE-2021-36088 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36088?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-36088?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST