{
  "threat_severity" : "Moderate",
  "public_date" : "2026-01-20T21:26:15Z",
  "bugzilla" : {
    "description" : "cpython: wsgiref.headers.Headers allows header newline injection in Python",
    "id" : "2431367",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2431367"
  },
  "cvss3" : {
    "cvss3_base_score" : "4.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-74",
  "details" : [ "User-controlled header names and values containing newlines can allow injecting HTTP headers.", "Missing newline filtering has been discovered in Python. User-controlled header names and values containing newlines can allow injecting HTTP headers." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-03-17T00:00:00Z",
    "advisory" : "RHSA-2026:4713",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "python3.12-0:3.12.12-3.el10_1.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-05T00:00:00Z",
    "advisory" : "RHSA-2026:2128",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "python3-0:3.6.8-73.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-12T00:00:00Z",
    "advisory" : "RHSA-2026:4463",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "python3.12-0:3.12.12-3.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-12T00:00:00Z",
    "advisory" : "RHSA-2026:4473",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "python3.11-0:3.11.13-5.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-05T00:00:00Z",
    "advisory" : "RHSA-2026:2128",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "python3-0:3.6.8-73.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-10T00:00:00Z",
    "advisory" : "RHSA-2026:4168",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "python3.9-0:3.9.25-3.el9_7.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-10T00:00:00Z",
    "advisory" : "RHSA-2026:4168",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "python3.9-0:3.9.25-3.el9_7.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-03-31T00:00:00Z",
    "advisory" : "RHSA-2026:6253",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "python3.11-0:3.11.7-1.el9_4.11"
  }, {
    "product_name" : "Red Hat Ceph Storage 8",
    "release_date" : "2026-03-24T00:00:00Z",
    "advisory" : "RHSA-2026:5606",
    "cpe" : "cpe:/a:redhat:ceph_storage:8::el9",
    "package" : "rhceph/rhceph-8-rhel9:sha256:1160569002c25d3d349bbe41b57eeffade438853d3419edca01813227440f414"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-03-18T00:00:00Z",
    "advisory" : "RHSA-2026:4943",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/cds-rhel9:sha256:200c27e9b396276bd505c6b41127ac5eb1d94d620172cb818ae733f2a21ac524"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-03-18T00:00:00Z",
    "advisory" : "RHSA-2026:4943",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/haproxy-rhel9:sha256:d98fd3fe5f5f9acd0efae7db19b61b864be1eb2fbe2586a1b6be2429fa2cc7a3"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-03-18T00:00:00Z",
    "advisory" : "RHSA-2026:4943",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/installer-rhel9:sha256:2c50c87906a1abebf427a70f401c409f1258cb55d2096f517db870ec991cfd7f"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-03-18T00:00:00Z",
    "advisory" : "RHSA-2026:4943",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/rhua-rhel9:sha256:5f1fbf66fb349a7baf066a1216d39989c3b89f18ec5108b96d9643baf4856778"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "python3.14",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Fix deferred",
    "package_name" : "python",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "python",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "python3",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "python36:3.6/python36",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "python39-devel:3.9/python39",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "python3.11",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "python3.12",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "python3.14",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Fix deferred",
    "package_name" : "rhelai3/bootc-aws-cuda-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Fix deferred",
    "package_name" : "rhelai3/bootc-azure-cuda-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Fix deferred",
    "package_name" : "rhelai3/bootc-cuda-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Fix deferred",
    "package_name" : "rhelai3/bootc-gcp-cuda-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-0865\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0865\nhttps://github.com/python/cpython/issues/143916\nhttps://github.com/python/cpython/pull/143917\nhttps://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/" ],
  "name" : "CVE-2026-0865",
  "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
}