{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-11T10:08:52Z",
  "bugzilla" : {
    "description" : "curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication",
    "id" : "2446448",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2446448"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-303",
  "details" : [ "libcurl can in some circumstances reuse the wrong connection when asked to do\nan Negotiate-authenticated HTTP or HTTPS request.\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\nWhen reusing a connection a range of criterion must first be met. Due to a\nlogical error in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials. One underlying reason being that\nNegotiate sometimes authenticates *connections* and not *requests*, contrary\nto how HTTP is designed to work.\nAn application that allows Negotiate authentication to a server (that responds\nwanting Negotiate) with `user1:password1` and then does another operation to\nthe same server also using Negotiate but with `user2:password2` (while the\nprevious connection is still alive) - the second request wrongly reused the\nsame connection and since it then sees that the Negotiate negotiation is\nalready made, it just sends the request over that connection thinking it uses\nthe user2 credentials when it is in fact still using the connection\nauthenticated for user1...\nThe set of authentication methods to use is set with  `CURLOPT_HTTPAUTH`.\nApplications can disable libcurl's reuse of connections and thus mitigate this\nproblem, by using one of the following libcurl options to alter how\nconnections are or are not reused: `CURLOPT_FRESH_CONNECT`,\n`CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the\ncurl_multi API).", "A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the authentication of a previous user, leading to an authentication bypass." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-08-17T00:00:00Z",
    "advisory" : "RHSA-2026:55450",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "curl-0:8.12.1-4.el10_2.3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-17T00:00:00Z",
    "advisory" : "RHSA-2026:55439",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "curl-0:7.76.1-40.el9_8.5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-17T00:00:00Z",
    "advisory" : "RHSA-2026:55439",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "curl-0:7.76.1-40.el9_8.5"
  }, {
    "product_name" : "Red Hat JBoss Core Services 2.4.62.SP5",
    "release_date" : "2026-08-19T00:00:00Z",
    "advisory" : "RHSA-2026:56869",
    "cpe" : "cpe:/a:redhat:jboss_core_services:1"
  }, {
    "product_name" : "Cert Manager support for Red Hat OpenShift release 1.19",
    "release_date" : "2026-09-03T00:00:00Z",
    "advisory" : "RHSA-2026:63135",
    "cpe" : "cpe:/a:redhat:cert_manager:1.19::el9",
    "package" : "cert-manager/cert-manager-operator-rhel9:1788348522"
  }, {
    "product_name" : "Cert Manager support for Red Hat OpenShift release 1.19",
    "release_date" : "2026-09-03T00:00:00Z",
    "advisory" : "RHSA-2026:63138",
    "cpe" : "cpe:/a:redhat:cert_manager:1.19::el9",
    "package" : "cert-manager/jetstack-cert-manager-acmesolver-rhel9:1788348571"
  }, {
    "product_name" : "Cert Manager support for Red Hat OpenShift release 1.19",
    "release_date" : "2026-09-03T00:00:00Z",
    "advisory" : "RHSA-2026:63138",
    "cpe" : "cpe:/a:redhat:cert_manager:1.19::el9",
    "package" : "cert-manager/jetstack-cert-manager-rhel9:1788348571"
  }, {
    "product_name" : "Cert Manager support for Red Hat OpenShift release 1.19",
    "release_date" : "2026-09-03T00:00:00Z",
    "advisory" : "RHSA-2026:63140",
    "cpe" : "cpe:/a:redhat:cert_manager:1.19::el9",
    "package" : "cert-manager/cert-manager-istio-csr-rhel9:1788348594"
  }, {
    "product_name" : "Red Hat Discovery 2",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61783",
    "cpe" : "cpe:/a:redhat:discovery:2::el9",
    "package" : "discovery/discovery-server-rhel9:1788205779"
  }, {
    "product_name" : "Red Hat Discovery 2",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61783",
    "cpe" : "cpe:/a:redhat:discovery:2::el9",
    "package" : "discovery/discovery-ui-rhel9:1788206196"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-07T00:00:00Z",
    "advisory" : "RHSA-2026:6893",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "curl-main-8.19.0-3.hum1"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-08-24T00:00:00Z",
    "advisory" : "RHSA-2026:58981",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/cds-kubernetes-tp-rhel9:1787241211"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-08-24T00:00:00Z",
    "advisory" : "RHSA-2026:58981",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/installer-tp-rhel9:1787135742"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-08-24T00:00:00Z",
    "advisory" : "RHSA-2026:58981",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/rhua-tp-rhel9:1787241260"
  } ],
  "package_state" : [ {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "build-of-trustee/trustee-rhel9",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "confidential-compute-attestation-tech-preview/trustee-rhel9",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-sandboxed-containers/osc-operator-bundle",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-sandboxed-containers/osc-podvm-builder-rhel9",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-sandboxed-containers/osc-podvm-payload-rhel9",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Confidential Compute Attestation",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-sandboxed-containers/osc-rhel9-operator",
    "cpe" : "cpe:/a:redhat:confidential_compute_attestation:1"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/cluster-logging-operator-bundle",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/cluster-logging-rhel9-operator",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/eventrouter-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/fluentd-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/log-file-metric-exporter-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/logging-view-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-logging/vector-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "s390utils",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "snphost",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "trustee",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "trustee-guest-components",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "snphost",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "trustee-guest-components",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Fix deferred",
    "package_name" : "rust",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat JBoss Core Services",
    "fix_state" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/a:redhat:jboss_core_services:1"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift4/recert-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift/ose-rhel-coreos-8",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift/ose-rhel-coreos-9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Fix deferred",
    "package_name" : "devspaces/code-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3"
  }, {
    "product_name" : "Red Hat Trusted Profile Analyzer",
    "fix_state" : "Fix deferred",
    "package_name" : "rhtpa/rhtpa-trustification-service-rhel9",
    "cpe" : "cpe:/a:redhat:trusted_profile_analyzer:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-1965\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1965\nhttps://curl.se/docs/CVE-2026-1965.html\nhttps://curl.se/docs/CVE-2026-1965.json" ],
  "name" : "CVE-2026-1965",
  "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
}