In Reactor Netty HTTP Server a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attackGHSA-xjhv-p3fv-x24r
HIGHFix: reactor/reactor-netty@b1dd46bGHSA-xjhv-p3fv-x24r is a high-severity (CVSS 7.5) Path Traversal vulnerability in io.projectreactor.netty:reactor-netty-http. A fix is available for io.projectreactor.netty:reactor-netty-http — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-xjhv-p3fv-x24r.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
io.projectreactor.netty:reactor-netty-http☕io.projectreactor.netty:reactor-netty-httpReal-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
In Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attack.
Specifically, an application is vulnerable if Reactor Netty HTTP Server is configured to serve static resources.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | io.projectreactor.netty:reactor-netty-http | ≥ 1.1.0&&< 1.1.13 | 1.1.13io.projectreactor.netty:reactor-netty-http:1.1.13 |
| ☕Maven | io.projectreactor.netty:reactor-netty-http | ≥ 1.0.0&&< 1.0.39 | 1.0.39io.projectreactor.netty:reactor-netty-http:1.0.39 |
Affected Products
reactor nettybroadcomDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.projectreactor.netty:reactor-netty-http, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update io.projectreactor.netty:reactor-netty-http to 1.1.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xjhv-p3fv-x24r is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
Frequently Asked Questions
Is GHSA-xjhv-p3fv-x24r in your dependencies?
Find it across Maven, including transitive dependencies.