{
  "threat_severity" : "Important",
  "public_date" : "2025-04-24T18:15:53Z",
  "bugzilla" : {
    "description" : "h11: h11 accepts some malformed Chunked-Encoding bodies",
    "id" : "2362162",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2362162"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.4",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-444",
  "details" : [ "h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.", "A flaw was found in the h11. This vulnerability allows request smuggling via improper parsing of chunked-coding message bodies, where h11 fails to validate the required \\r\\n terminators." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Ansible Automation Platform 2.4 for RHEL 8",
    "release_date" : "2025-06-05T00:00:00Z",
    "advisory" : "RHSA-2025:8615",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.4::el8",
    "package" : "ansible-automation-platform-24/lightspeed-rhel8:2.4.250225-12"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
    "release_date" : "2025-05-27T00:00:00Z",
    "advisory" : "RHSA-2025:8221",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.5::el8",
    "package" : "ansible-automation-platform-25/ee-supported-rhel8:1.0.0-1016"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
    "release_date" : "2025-05-27T00:00:00Z",
    "advisory" : "RHSA-2025:8221",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.5::el8",
    "package" : "ansible-automation-platform-25/lightspeed-chatbot-rhel8:2.5.250528-1"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
    "release_date" : "2025-05-27T00:00:00Z",
    "advisory" : "RHSA-2025:8221",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.5::el8",
    "package" : "ansible-automation-platform-25/lightspeed-rhel8:2.5.250528-1"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2.5 for RHEL 9",
    "release_date" : "2025-05-27T00:00:00Z",
    "advisory" : "RHSA-2025:8221",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.5::el9",
    "package" : "ansible-automation-platform-25/ee-cloud-services-rhel9:1.0.0-309"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2.5 for RHEL 9",
    "release_date" : "2025-05-27T00:00:00Z",
    "advisory" : "RHSA-2025:8221",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.5::el9",
    "package" : "ansible-automation-platform-25/ee-supported-rhel9:1.0.0-1015"
  }, {
    "product_name" : "Red Hat OpenStack Platform 17.1 for RHEL 9",
    "release_date" : "2025-05-14T00:00:00Z",
    "advisory" : "RHSA-2025:7536",
    "cpe" : "cpe:/a:redhat:openstack:17.1::el9",
    "package" : "python-h11-0:0.12.0-2.1.el9ost"
  }, {
    "product_name" : "Red Hat OpenStack Services on OpenShift 18.0",
    "release_date" : "2025-05-14T00:00:00Z",
    "advisory" : "RHSA-2025:7535",
    "cpe" : "cpe:/a:redhat:openstack:18.0::el9",
    "package" : "python-h11-0:0.12.0-4.el9ost"
  } ],
  "package_state" : [ {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Affected",
    "package_name" : "openshift-lightspeed-tech-preview/lightspeed-service-api-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-24/lightspeed-rhel8",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-24/platform-resource-runner-rhel8",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-25/ee-cloud-services-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-25/ee-supported-rhel8",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-25/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-25/platform-resource-runner-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-amd-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-aws-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-azure-amd-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-azure-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-gcp-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-ibm-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-intel-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/bootc-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Not affected",
    "package_name" : "rhelai1/docling-serve-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/instructlab-amd-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/instructlab-intel-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Affected",
    "package_name" : "rhelai1/instructlab-nvidia-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI)",
    "fix_state" : "Not affected",
    "package_name" : "rhelai1/ui-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:1"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-model-registry-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Not affected",
    "package_name" : "python-h11",
    "cpe" : "cpe:/a:redhat:satellite:6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-43859\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-43859\nhttps://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed\nhttps://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj" ],
  "name" : "CVE-2025-43859",
  "mitigation" : {
    "value" : "Ensure any applications using h11 are behind a correctly configured reverse proxy will prevent exploitation of this flaw.",
    "lang" : "en:us"
  },
  "csaw" : false
}