CVE-2018-8088 is a critical-severity (CVSS 9.8) vulnerability in org.slf4j:slf4j-ext. EPSS puts its 30-day exploitation probability at 14.7% (97th percentile). A fix is available for org.slf4j:slf4j-ext — see the affected versions and patch details below.
Improper Access Control in SLF4J
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-2018-8088 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 377,333 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
org.slf4j:slf4j-ext☕org.slf4j:slf4j-extReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta2 allows remote attackers to bypass intended access restrictions via crafted data. EventData in the slf4j-ext module in QOS.CH SLF4J, has been fixed in SLF4J versions 1.7.26 later and in the 2.0.x series.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.slf4j:slf4j-ext | all versions | 1.7.26org.slf4j:slf4j-ext:1.7.26 |
| ☕Maven | org.slf4j:slf4j-ext | ≥ 1.8.0-alpha0&&< 1.8.0-beta4 | 1.8.0-beta4org.slf4j:slf4j-ext:1.8.0-beta4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.slf4j:slf4j-ext, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.slf4j:slf4j-ext to 1.7.26 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-8088 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-2018-8088 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2018-8088. 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.
Subscription Asset Manager is now in a reduced support phase receiving only Critical impact security fixes. This issue has been rated as having a security impact of Important, and is not currently planned to be addressed in future updates. This issue did not affect the versions of Candlepin as shipped with Red Hat…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Data Grid | see advisory | RHSA-2018:1575 |
| Red Hat Enterprise Linux 7 | slf4j-0:1.7.4-4.el7_4 | RHSA-2018:0592 |
| Red Hat Fuse 7.4.0 | slf4j | RHSA-2019:2413 |
| Red Hat JBoss BPMS 6.4 | slf4j | RHSA-2018:2419 |
| Red Hat JBoss BRMS 6.4 | slf4j | RHSA-2018:2420 |
| Red Hat JBoss BRMS 7.0 | see advisory | RHSA-2018:2143 |
| Red Hat JBoss Data Virtualization 6.4.8 | slf4j | RHSA-2019:3140 |
| Red Hat JBoss EAP 7.1 | see advisory | RHSA-2018:0629 |
Frequently Asked Questions
Is CVE-2018-8088 in your dependencies?
O3 Security finds CVE-2018-8088 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.