{"cve":"CVE-2025-66560","nvd":{"published":"2026-01-07T18:15:52.023","modified":"2026-10-07T09:10:00.160","status":"Analyzed","description":"Quarkus is a Cloud Native, (Linux) Container First framework for writing Java applications. Prior to versions 3.31.0, 3.27.2, and 3.20.5, 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. This issue has been patched in versions 3.31.0, 3.27.2, and 3.20.5. A workaround involves implementing a health check that monitors the status and saturation of the worker thread pool to detect abnormal thread retention early.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/quarkusio/quarkus/security/advisories/GHSA-5rfx-cp42-p624"],"products":["quarkus:quarkus"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2025-66560","score":0.00383,"percentile":0.32028,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-5rfx-cp42-p624","url":"https://osv.dev/vulnerability/GHSA-5rfx-cp42-p624","summary":"Quarkus REST has potential worker thread starvation when HTTP connection is closed while waiting to write","modified":"2026-09-10T03:49:54.436300187Z","packages":[{"ecosystem":"Maven","name":"io.quarkus:quarkus-rest","purl":"pkg:maven/io.quarkus/quarkus-rest","ranges":["<3.20.5"],"fixed":["3.20.5"]},{"ecosystem":"Maven","name":"io.quarkus:quarkus-rest","purl":"pkg:maven/io.quarkus/quarkus-rest","ranges":[">=3.21.0 <3.27.2"],"fixed":["3.27.2"]},{"ecosystem":"Maven","name":"io.quarkus:quarkus-rest","purl":"pkg:maven/io.quarkus/quarkus-rest","ranges":[">=3.30.0 <3.31.0"],"fixed":["3.31.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}