Red Hat has issued an Important security update for its build of Quarkus to address multiple vulnerabilities, including denial of service via memory exhaustion in Netty's SPDY-to-HTTP codec (CVE-2026-56745), information disclosure via improper cookie domain validation in Eclipse Vert.x Web Client (CVE-2026-15076, CVSS 7.5), and an unbounded memory accumulation flaw in the RESTEasy Reactive client processor. The update resolves these and other CVEs by providing Red Hat build of Quarkus version 3.27.4.SP3. Affected users should apply this patch following Red Hat's standard update procedures.
Red Hat Product Errata RHSA-2026:47189 - Security Advisory Issued: 2026-07-29 Updated: 2026-07-29 RHSA-2026:47189 - Security Advisory Overview Synopsis Important: Red Hat build of Quarkus 3.27.4.SP3 security update Type/Severity Security Advisory: Important Topic An update is now available for Red Hat build of Quarkus. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability. For more information, see the CVE links in the References section. Description This release of Red Hat build of Quarkus 3.27.4.SP3 includes the following CVE fixes: resteasy-reactive-client-processor: Quarkus REST - Unbounded multipart MIME part-header accumulation allows remote OOM denial of service [quarkus-3.27] (CVE-2026-16308) vertx-core: Eclipse Vert.x: Information disclosure via improper handling of HTTP 30x redirects [quarkus-3.27] (CVE-2026-15075) vertx-web-client: Eclipse Vert.x Web Client: Information disclosure via improper cookie domain validation [quarkus-3.27] (CVE-2026-15076) netty-codec- http: Netty: Denial of Service via SPDY header decompression amplification [quarkus-3.27] (CVE-2026-55833) netty-codec- http: Netty: Denial of Service via SPDY SETTINGS frame processing [quarkus-3.27] (CVE-2026-55831) netty-codec-haproxy: Netty codec-haproxy: Denial of Service via crafted PROXY protocol v2 message [quarkus-3.27] (CVE-2026-55851) netty-codec- http: Netty: Denial of Service via memory exhaustion in SPDY-to-HTTP codec [quarkus-3.27] (CVE-2026-56745) netty-codec- http: Netty: Security control bypass allows unauthorized requests via null origin header [quarkus-3.27] (CVE-2026-56746) netty-codec-http2: Netty: Denial of Service via HTTP/2 DATA frame memory leak [quarkus-3.27] (CVE-2026-56819) netty-codec- http: Netty: Memory exhaustion in netty-codec-http (decompression bomb) [quarkus-3.27] (CVE-2026-59899) netty-codec- http: Netty: CRLF Injection via Multipart Filename in Netty HttpPostRequestEncoder [quarkus-3.27] (CVE-2026-59921) netty-codec-http2: Netty: Improper header neutralization in netty-codec-http2 [quarkus-3.27] (CVE-2026-59900) netty-codec- http: Netty: Protocol version confusion in netty-codec-http (WebSocket) [quarkus-3.27] (CVE-2026-59898) For more information, see the release notes page listed in the References section. Solution Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat build of Quarkus Text-Only Advisories x86_64 Fixes QUARKUS-8544 - Error "Cached seed values" during Native compilation CVEs CVE-2026-15075 CVE-2026-15076 CVE-2026-16308 CVE-2026-55831 CVE-2026-55833 CVE-2026-55851 CVE-2026-56745 CVE-2026-56746 CVE-2026-56819 CVE-2026-59898 CVE-2026-59899 CVE-2026-59900 CVE-2026-59921 References https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/products/quarkus/ https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=redhat.quarkus&downloadType=distributions&version=3.27.4.SP3 https://docs.redhat.com/en/documentation/red_hat_build_of_quarkus/3.27 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .