{
  "threat_severity" : "Important",
  "public_date" : "2026-07-03T06:16:06Z",
  "bugzilla" : {
    "description" : "curl: Information disclosure due to uncleared proxy authentication state",
    "id" : "2496769",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2496769"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-201",
  "details" : [ "When reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.", "A flaw was found in libcurl. When reusing a libcurl handle for sequential transfers with environment-variable proxy configuration, the library does not properly clear the proxy authentication state. This oversight can lead to the unintended disclosure of `Proxy-Authorization` headers to an incorrect proxy, potentially exposing sensitive authentication information to an unauthorized entity. This is an information disclosure vulnerability." ],
  "statement" : "This Important information disclosure vulnerability in libcurl arises when a handle is reused for sequential transfers with environment-variable proxy configurations, failing to clear the proxy authentication state. This oversight can lead to `Proxy-Authorization` headers being inadvertently sent to an incorrect proxy, potentially exposing sensitive authentication information in Red Hat environments utilizing multiple proxy configurations. This flaw leads only to a confidentiality impact. There has been no observed integrity impact.",
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-06-24T00:00:00Z",
    "advisory" : "RHSA-2026:29017",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "curl-main-8.21.0-0.1.hum1",
    "impact" : "important"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-07-02T00:00:00Z",
    "advisory" : "RHSA-2026:34975",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "rust-main-1.96.1-1.hum1",
    "impact" : "important"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "dotnet8.0",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat JBoss Core Services",
    "fix_state" : "Affected",
    "package_name" : "libcurl-1.dll",
    "cpe" : "cpe:/a:redhat:jboss_core_services:1"
  }, {
    "product_name" : "Red Hat JBoss Core Services",
    "fix_state" : "Affected",
    "package_name" : "libcurl.so",
    "cpe" : "cpe:/a:redhat:jboss_core_services:1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-8927\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-8927\nhttps://curl.se/docs/CVE-2026-8927.html\nhttps://curl.se/docs/CVE-2026-8927.json\nhttps://hackerone.com/reports/3744543" ],
  "name" : "CVE-2026-8927",
  "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
}