{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-20T00:45:28Z",
  "bugzilla" : {
    "description" : "rsync: Rsync: Denial of Service via malformed HTTP proxy response",
    "id" : "2480057",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2480057"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.9",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-193",
  "details" : [ "Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.", "A flaw was found in rsync. A network attacker can exploit an off-by-one out-of-bounds stack write vulnerability in the `establish_proxy_connection()` function by sending a malformed HTTP proxy response. This occurs when the `RSYNC_PROXY` environment variable is set and the attacker sends a response line of 1023 or more bytes without a newline terminator. This can corrupt stack memory, potentially leading to a Denial of Service (DoS)." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "rsync",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Fix deferred",
    "package_name" : "rsync",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "rsync",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "rsync",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "rsync",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Fix deferred",
    "package_name" : "rhcos",
    "cpe" : "cpe:/a:redhat:openshift:4"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-45232\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45232\nhttps://github.com/RsyncProject/rsync/releases/tag/v3.4.3\nhttps://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8\nhttps://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy" ],
  "name" : "CVE-2026-45232",
  "mitigation" : {
    "value" : "To mitigate this issue, ensure that the `RSYNC_PROXY` environment variable is not set. If rsync is configured to use an HTTP proxy via this variable, unsetting it will prevent exploitation. To unset the `RSYNC_PROXY` environment variable for the current session, use: `unset RSYNC_PROXY`. For a more permanent solution, ensure that `RSYNC_PROXY` is not defined in system-wide or user-specific environment configuration files. Note that this mitigation will disable rsync's ability to use an HTTP proxy, which may impact functionality if proxy usage is required.",
    "lang" : "en:us"
  },
  "csaw" : false
}