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CVE-2026-45232

Estado: AnalizadaBaja (2.1)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Samba — Rsync

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-45232",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-05-20T17:30:10.337296Z"
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    "cvssMetricV31": [
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          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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        {
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              "version": "0",
              "lessThan": "3.4.3",
              "versionType": "semver"
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  "published": "2026-05-20T02:16:36.887",
  "references": [
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      "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3",
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        "Release Notes"
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      "url": "https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy",
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    },
    {
      "lang": "es",
      "value": "Las versiones de Rsync anteriores a la 3.4.3 contienen una vulnerabilidad de escritura fuera de límites de la pila por un byte (off-by-one) en la función establish_proxy_connection() en socket.c que permite a los atacantes de red corromper la memoria de la pila enviando una respuesta de proxy HTTP malformada. Los atacantes pueden explotar esto posicionándose entre el cliente y el proxy o controlando el servidor proxy para enviar una línea de respuesta de 1023 o más bytes sin un terminador de nueva línea, causando que se escriba un byte nulo en una dirección de pila fuera de límites cuando la variable de entorno RSYNC_PROXY está configurada."
    }
  ],
  "lastModified": "2026-07-24T09:10:00.153",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*",
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