Fluentd vulnerable to remote code execution due to insecure deserialization (in non-default configuration)
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-502.
Summary
Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. A remote code execution (RCE) vulnerability in non-default configurations of Fluentd allows unauthenticated attackers to execute arbitrary code via specially crafted JSON payloads. Fluentd setups are only affected if the environment variable `FLUENT_OJ_OPTION_MODE` is explicitly set to `object`. Please note: The option FLUENT_OJ_OPTION_MODE was introduced in Fluentd version 1.13.2. Earlier versions of Fluentd are not affected by this vulnerability. This issue was patched in version 1.15.3. As a workaround do not use `FLUENT_OJ_OPTION_MODE=object`.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fluent | fluentd | 1.13.2 to before 1.15.3 | 1.15.3 | Patch available | CNA |
| — | fluentd (RubyGems) | 1.13.2 to before 1.15.3 | 1.15.3 | Patch available | GHSA-fppq-mj76-fpj2 |
- fluentd Vendorfluent Affected 1.13.2 to before 1.15.3 Fixed in 1.15.3 Patch available CNA
- fluentd (RubyGems) Vendor— Affected 1.13.2 to before 1.15.3 Fixed in 1.15.3 Patch available GHSA-fppq-mj76-fpj2
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:* | 1.13.2 to before 1.15.3 | Vulnerable | fluent |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
- cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:* Versions 1.13.2 to before 1.15.3 Vulnerable ·fluent
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
Remediation
- Fix · CNA fluentd (fluent) Fixed in 1.15.3
- Fix · GHSA-fppq-mj76-fpj2 fluentd (RubyGems) Fixed in 1.15.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Out of support scope |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Out of support scope |
Not affected: 1 product
- Logging Subsystem for Red Hat OpenShift
Timeline
- 2026-10-02 Threatist record created from CVE-2022-39379
- 2026-10-03 Alias added: GHSA-fppq-mj76-fpj2
References
Advisory 3
More Fluentd vulnerabilities
- TI-2026-32064 Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder CVSS 3.1CRITICAL 9.8
- TI-2017-07995 Escape sequence injection vulnerability in Fluentd versions 0.12.29 through 0.12.40 may… CVSS 3.0CRITICAL 9.8
- TI-2020-14076 An issue was discovered in Fluent-ui v.1.2.2 allows attackers to gain escalated… CVSS 3.1HIGH 8.8
- TI-2026-32142 Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward` CVSS 3.1HIGH 7.5
- TI-2026-32065 Fluentd: Exposure of Sensitive Information via Monitor Agent API CVSS 3.1HIGH 7.5
- TI-2026-32143 Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http` CVSS 3.1HIGH 7.2
Sources
- CVE-2022-39379 · CVE Program
- CVE-2022-39379 · NVD
- FIRST EPSS
- GHSA-fppq-mj76-fpj2 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-39379 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences