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CVE-2026-73552

Estado: AnalizadaAlta (7.5)—

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy HTTP RBAC accepts RFC-valid opaque header bytes but evaluates safe_regex values with RE2's UTF-8 subject semantics. A downstream client can preserve a prohibited marker and add an unrelated obs-text octet, causing RE2::FullMatch to return false and a negative RBAC policy to treat the invalid subject as an ordinary no-match. A byte-oriented route matcher can still observe the marker, allowing the request to reach a route intended to be denied.

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The relevant scope boundary is that plain positive ALLOW regexes normally fail closed, and exact, prefix, suffix, and contains matchers are not shown to have this subject-domain failure. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Envoyproxy — Envoy

CWE

Referencias

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{
  "id": "CVE-2026-73552",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73552",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-22T14:15:40.919777Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
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        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
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  "affected": [
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      "source": "security-advisories@github.com",
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              "version": "< 1.36.10"
            },
            {
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              "version": ">= 1.37.0, < 1.37.6"
            },
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              "version": ">= 1.39.0, < 1.39.1"
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  "published": "2026-09-21T20:17:28.900",
  "references": [
    {
      "url": "https://github.com/envoyproxy/envoy/commit/5650cb9770d4420ec2bcbed8b90be06f564ecc07",
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      "tags": [
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    {
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      "tags": [
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1",
      "tags": [
        "Release Notes"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-23xh-2qxr-3xv8",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy HTTP RBAC accepts RFC-valid opaque header bytes but evaluates safe_regex values with RE2's UTF-8 subject semantics. A downstream client can preserve a prohibited marker and add an unrelated obs-text octet, causing RE2::FullMatch to return false and a negative RBAC policy to treat the invalid subject as an ordinary no-match. A byte-oriented route matcher can still observe the marker, allowing the request to reach a route intended to be denied. The relevant scope boundary is that plain positive ALLOW regexes normally fail closed, and exact, prefix, suffix, and contains matchers are not shown to have this subject-domain failure. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1."
    }
  ],
  "lastModified": "2026-10-05T14:35:24.370",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6A420B14-9ADA-4F6B-ACAA-3045E8690F04",
              "versionEndExcluding": "1.36.10"
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              "vulnerable": true,
              "matchCriteriaId": "1AD376F3-22D7-4BFB-B00C-BD68F464436F",
              "versionEndExcluding": "1.37.6",
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              "vulnerable": true,
              "matchCriteriaId": "840E030F-8746-4DBD-87C0-5DF7896294CC",
              "versionEndExcluding": "1.38.4",
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            },
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              "matchCriteriaId": "B5C1C594-8142-4F51-BE50-1AF50FD07129",
              "versionEndExcluding": "1.39.1",
              "versionStartIncluding": "1.39.0"
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}