CVE-2017-10906 is a critical-severity (CVSS 9.8) vulnerability in fluentd. A fix is available for fluentd — see the affected versions and patch details below.
Fluentd Escape Sequence Injection Vulnerability
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2017-10906 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
fluentdReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
Escape sequence injection vulnerability in Fluentd versions 0.12.29 through 0.12.40 may allow an attacker to change the terminal UI or execute arbitrary commands on the device via unspecified vectors.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | fluentd | ≥ 0.12.29&&< 0.12.41 | 0.12.41bundle update fluentd --conservative |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for fluentd, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update fluentd to 0.12.41 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-10906 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2017-10906 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2017-10906. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This flaw requires particular preconditions to be exploitable, which are not common in supported deployments of fluentd. The vulnerable system must have all of: 1. A filter_parser enabled in fluentd.conf 2. Fluentd running in non-daemon mode or a bad syslog server that doesn't sanitise escape sequences (rsyslog…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenStack Platform 13.0 Operational Tools for RHEL 7 | fluentd-0:0.12.41-1.el7 | RHSA-2018:2225 |
Frequently Asked Questions
Is CVE-2017-10906 in your dependencies?
O3 Security finds CVE-2017-10906 across RubyGems dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.