CVE-2025-66560
Medium · 5.9CVSS
5.9
EPSS
0.4%
Published
Jan 7, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Maven | io.quarkus:quarkus-rest | 0 | 3.20.5 |
| Maven | io.quarkus:quarkus-rest | 3.21.0 | 3.27.2 |
| Maven | io.quarkus:quarkus-rest | 3.30.0 | 3.31.0 |
| Chainguard | keycloak-26.3-iamguarded-compat | 0 | 26.3.5-r7 |
| Chainguard | keycloak-26.5 | 0 | 26.5.1-r0 |
| Chainguard | keycloak-26.5-iamguarded-compat | 0 | 26.5.1-r0 |
| Chainguard | keycloak-fips-26.5 | 0 | 26.5.2-r0 |
| Chainguard | keycloak-fips-26.5-iamguarded-fips | 0 | 26.5.2-r0 |
| Wolfi | keycloak-26.3-iamguarded-compat | 0 | 26.3.5-r7 |
| Wolfi | keycloak-26.5 | 0 | 26.5.1-r0 |
| Wolfi | keycloak-26.5-iamguarded-compat | 0 | 26.5.1-r0 |
| maven | io.quarkus/quarkus-rest | 3.21.0 | 3.27.2 |
| maven | io.quarkus/quarkus-rest | 3.30.0 | 3.31.0 |
Related vulnerabilities
- CVE-2025-67735 Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-14082 A flaw was found in Keycloak Admin REST (Representational State Transfer) API. Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-13467 A flaw was found in the Keycloak LDAP User Federation provider. Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-66021 OWASP Java HTML Sanitizer is vulnerable to XSS via noscript tag and improper style tag… Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-11538 A vulnerability exists in Keycloak's server distribution where enabling debug mode… Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-12390 A flaw was found in Keycloak. Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-10939 A flaw was found in Keycloak. Also affects keycloak-26.3-iamguarded-compat
- CVE-2025-11429 A flaw was found in Keycloak. Also affects keycloak-26.3-iamguarded-compat