{
  "threat_severity" : "Important",
  "public_date" : "2026-06-04T17:43:36Z",
  "bugzilla" : {
    "description" : "github.com/quic-go/quic-go: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers",
    "id" : "2484875",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2484875"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-770",
  "details" : [ "quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an `http.Header` for the corresponding `http.Request` or `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded.", "A flaw was found in quic-go, an implementation of the QUIC protocol in Go. A remote attacker can exploit this by sending specially crafted HTTP/3 trailer fields. This can cause the system to allocate excessive memory, leading to a denial-of-service (DoS) condition where the affected server or client may crash or run out of resources." ],
  "statement" : "This is an Important denial-of-service flaw in `quic-go` that allows a remote attacker to exhaust system memory by sending specially crafted HTTP/3 trailer fields. This can lead to crashes or resource unavailability in affected Red Hat products utilizing `quic-go` for HTTP/3 communication, impacting both client and server implementations.",
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-05-09T00:00:00Z",
    "advisory" : "RHSA-2026:15862",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "trivy-main-0.69.3-1.2.hum1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-07-15T00:00:00Z",
    "advisory" : "RHSA-2026:40223",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "caddy-main-2.11.4-0.2.hum1"
  } ],
  "package_state" : [ {
    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/istio-cni-rhel8",
    "cpe" : "cpe:/a:redhat:service_mesh:2"
  }, {
    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/pilot-rhel8",
    "cpe" : "cpe:/a:redhat:service_mesh:2"
  }, {
    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/proxyv2-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:2"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/istio-cni-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/istio-pilot-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/istio-proxyv2-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Not affected",
    "package_name" : "redhat-user-workloads/lighthouse-agent-0-20",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Not affected",
    "package_name" : "redhat-user-workloads/lighthouse-coredns-0-20",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Will not fix",
    "package_name" : "redhat-user-workloads/volsync-0-12",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Will not fix",
    "package_name" : "redhat-user-workloads/volsync-bundle-0-12",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Not affected",
    "package_name" : "rhacm2/lighthouse-agent-rhel9",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Affected",
    "package_name" : "rhacm2/lighthouse-coredns-rhel9",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Will not fix",
    "package_name" : "rhacm2/volsync-operator-bundle",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Will not fix",
    "package_name" : "rhacm2/volsync-rhel9",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-26/receptor-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-27/ee-supported-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-27/receptor-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "receptor",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "rust",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Affected",
    "package_name" : "openshift4/ose-coredns-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Affected",
    "package_name" : "redhat-user-workloads/art-images",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Not affected",
    "package_name" : "odf4/odf-blackbox-exporter-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Affected",
    "package_name" : "devspaces/traefik-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3"
  }, {
    "product_name" : "Red Hat OpenShift Virtualization 4",
    "fix_state" : "Affected",
    "package_name" : "container-native-virtualization/kubevirt-apiserver-proxy-rhel9",
    "cpe" : "cpe:/a:redhat:container_native_virtualization:4"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-40898\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-40898\nhttps://github.com/quic-go/quic-go/releases/tag/v0.59.1\nhttps://github.com/quic-go/quic-go/security/advisories/GHSA-vvgj-x9jq-8cj9" ],
  "name" : "CVE-2026-40898",
  "mitigation" : {
    "value" : "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.",
    "lang" : "en:us"
  },
  "csaw" : false
}