Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.6
Red Hat OpenShift Service Mesh 3.2.6, which is based on the open source Istio project, addresses a variety of problems in a microservice architecture by creating a centralized point of control in an application. Security Fix(es): * openshift-service-mesh/istio-proxyv2-rhel9: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack (CVE-2026-47774)
AI Analysis
Technical Summary
CVE-2026-47774 is a denial-of-service vulnerability in Envoy's HTTP/2 HPACK header compression implementation, used in Red Hat OpenShift Service Mesh. The vulnerability allows a remote attacker to send crafted HTTP/2 requests that trigger disproportionately large memory allocations on the server, causing resource exhaustion and denial of service. This is due to improper handling of highly compressed data (CWE-409). Red Hat OpenShift Service Mesh versions >=3.0.0 and <3.2.6 are affected. Red Hat has issued a security advisory (RHSA-2026:26231) and released version 3.2.6 with a fix.
Potential Impact
The vulnerability can cause high resource consumption (CPU and memory) on affected systems, leading to degraded performance or system crashes due to denial of service. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Red Hat has released OpenShift Service Mesh version 3.2.6 which addresses this vulnerability. Users should upgrade to version 3.2.6 or later to remediate the issue. Refer to the Red Hat security advisory RHSA-2026:26231 and official documentation for detailed upgrade instructions. No other mitigations are specified or required.
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.6
Description
Red Hat OpenShift Service Mesh 3.2.6, which is based on the open source Istio project, addresses a variety of problems in a microservice architecture by creating a centralized point of control in an application. Security Fix(es): * openshift-service-mesh/istio-proxyv2-rhel9: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack (CVE-2026-47774)
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47774 is a denial-of-service vulnerability in Envoy's HTTP/2 HPACK header compression implementation, used in Red Hat OpenShift Service Mesh. The vulnerability allows a remote attacker to send crafted HTTP/2 requests that trigger disproportionately large memory allocations on the server, causing resource exhaustion and denial of service. This is due to improper handling of highly compressed data (CWE-409). Red Hat OpenShift Service Mesh versions >=3.0.0 and <3.2.6 are affected. Red Hat has issued a security advisory (RHSA-2026:26231) and released version 3.2.6 with a fix.
Potential Impact
The vulnerability can cause high resource consumption (CPU and memory) on affected systems, leading to degraded performance or system crashes due to denial of service. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Red Hat has released OpenShift Service Mesh version 3.2.6 which addresses this vulnerability. Users should upgrade to version 3.2.6 or later to remediate the issue. Refer to the Red Hat security advisory RHSA-2026:26231 and official documentation for detailed upgrade instructions. No other mitigations are specified or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:26231
- Cve Count
- 1
- Cvss Version
- 3.1
Threat ID: 6a32705b0b89be68881d44da
Added to database: 06/17/2026, 10:00:59 UTC
Last enriched: 08/16/2026, 15:51:28 UTC
Last updated: 09/13/2026, 23:10:37 UTC
Views: 324
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