{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-29T00:00:00Z",
  "bugzilla" : {
    "description" : "curl: curl: Proxy credential disclosure via redirects to unauthenticated proxies",
    "id" : "2461202",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2461202"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-201",
  "details" : [ "A flaw was found in curl. When curl is configured to use distinct proxies for different URL schemes, a redirect from a URL using an authenticated proxy to one using an unauthenticated proxy can inadvertently expose the initial proxy's credentials. This improper credential management (CWE-522) may allow an attacker to gain unauthorized access or information by intercepting these disclosed credentials." ],
  "statement" : "Moderate: This flaw in curl and libcurl allows proxy credentials to be inadvertently exposed to a second proxy during a redirect. This issue arises when curl is configured to use distinct proxies for different URL schemes, the initial proxy requires authentication, and a subsequent proxy does not. Red Hat products utilizing curl or libcurl in such a specific proxy chaining configuration may be affected.",
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-05-02T00:00:00Z",
    "advisory" : "RHSA-2026:12916",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "curl-main-8.20.0-0.1.hum1"
  } ],
  "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" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "s390utils",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "snphost",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "trustee",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "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" : "Fix deferred",
    "package_name" : "curl",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "snphost",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "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 Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "rust",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "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" : "rhcos",
    "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-2026-6253\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6253\nhttps://curl.se/docs/CVE-2026-6253.html" ],
  "name" : "CVE-2026-6253",
  "mitigation" : {
    "value" : "To mitigate this issue, avoid configuring curl or libcurl to use proxies that require credentials. This prevents the scenario where credentials for a first proxy could be inadvertently passed to a second proxy during a redirect.",
    "lang" : "en:us"
  },
  "csaw" : false
}