GHSA-5rfx-cp42-p624 — quarkus-rest
MEDIUMGHSA-5rfx-cp42-p624 is a medium-severity (CVSS 5.9) CWE-770 vulnerability in io.quarkus:quarkus-rest. A fix is available for io.quarkus:quarkus-rest — see the affected versions and patch details below.
Quarkus REST has potential worker thread starvation when HTTP connection is closed while waiting to write
Exploitation Status
No confirmed exploitation observed yet
- 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-5rfx-cp42-p624.
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
GHSA-5rfx-cp42-p624 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 379,145 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
io.quarkus:quarkus-rest☕io.quarkus:quarkus-rest☕io.quarkus:quarkus-restReal-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
A vulnerability exists in the HTTP layer of Quarkus REST related to response handling. When a response is being written, the framework waits for previously written response chunks to be fully transmitted before proceeding. If the client connection is dropped during this waiting period, the associated worker thread is never released and becomes permanently blocked. Under sustained or repeated occurrences, this can exhaust the available worker threads, leading to degraded performance, or complete unavailability of the application.
Workarounds
For versions without the fix applied, it is recommended to implement a health check that monitors the status and saturation of the worker thread pool. This helps detect abnormal thread retention early and allows operators to take corrective action before the application’s responsiveness is impacted.
Credits
CVE reported by Shaswata Jash, Nokia
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | io.quarkus:quarkus-rest | all versions | 3.20.5io.quarkus:quarkus-rest:3.20.5 |
| ☕Maven | io.quarkus:quarkus-rest | ≥ 3.21.0&&< 3.27.2 | 3.27.2io.quarkus:quarkus-rest:3.27.2 |
| ☕Maven | io.quarkus:quarkus-rest | ≥ 3.30.0&&< 3.31.0 | 3.31.0io.quarkus:quarkus-rest:3.31.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.quarkus:quarkus-rest, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update io.quarkus:quarkus-rest to 3.20.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5rfx-cp42-p624 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 GHSA-5rfx-cp42-p624 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-5rfx-cp42-p624. 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 vulnerability is rated Moderate for Red Hat products utilizing Quarkus REST, including Red Hat AMQ, Cryostat, Enterprise Application Platform, OpenShift Container Platform, and Red Hat Build of Quarkus. The flaw in the HTTP layer can lead to an application-level denial of service if remote attackers repeatedly…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat build of Quarkus 3.20.5 | quarkus-rest | RHSA-2026:1899 |
| Red Hat build of Quarkus 3.27.2 | quarkus-rest | RHSA-2026:1965 |
Frequently Asked Questions
Is GHSA-5rfx-cp42-p624 in your dependencies?
O3 Security finds GHSA-5rfx-cp42-p624 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.