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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-48042] Denial of Service via deeply nested JSON objects

This high-severity Red Hat Linux advisory covers CVE-2026-48042 affecting Red Hat OpenShift Service Mesh 3.0, Red Hat OpenShift Service Mesh 3.1, Red Hat OpenShift Service Mesh 3.2.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-48042 Source published Source updated

VulniPulse record published Record updated

CVE-2026-48042
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, destructor of JSON Object results in stack overflow when deeply O(100K) nested objects are present.

This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1. A remote attacker could exploit this vulnerability by sending deeply nested JSON objects to the affected system.

This could lead to a stack overflow during the destruction of JSON objects, resulting in a Denial of Service (DoS) for the Envoy proxy. This vulnerability affects systems where Envoy is deployed and exposed to untrusted input, potentially disrupting critical proxy functionalities.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-776.

Affected Red Hat products: Red Hat OpenShift Service Mesh 3.0; Red Hat OpenShift Service Mesh 3.1; Red Hat OpenShift Service Mesh 3.2; Red Hat OpenShift Service Mesh 3.3; OpenShift Service Mesh 2. Will not fix / out of support: OpenShift Service Mesh 2.

Red Hat fixing advisory: RHSA-2026:49705, RHSA-2026:49729, RHSA-2026:49744, RHSA-2026:49765.

Affected versions
  • < 1.35.11
  • < 1.36.7
  • < 1.37.3
  • < 1.38.1

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

Fixed versions
  • 1.35.11
  • 1.36.7
  • 1.37.3
  • 1.38.1
  • openshift-service-mesh/istio-proxyv2-rhel9:1784908682
  • openshift-service-mesh/istio-proxyv2-rhel9:1784953556
  • openshift-service-mesh/istio-proxyv2-rhel9:1784953743
  • openshift-service-mesh/istio-proxyv2-rhel9:1784908639
  • RHSA-2026:49705
  • RHSA-2026:49729
  • RHSA-2026:49744
  • RHSA-2026:49765

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

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