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CVE-2026-67591

Status: AnalyzedMedium (6.5)—

An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service.

This issue affects Apache Qpid ProtonJ2: through 1.1.0.

Users are recommended to upgrade to version 1.2.0, which fixes the issue.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Apache — Qpid Protonj2

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-67591",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-67591",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-06T15:15:26.271451Z"
        }
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    "cvssMetricV31": [
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        "cvssData": {
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Qpid ProtonJ2",
          "versions": [
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              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "1.1.0"
            }
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          "packageName": "org.apache.qpid:protonj2",
          "collectionURL": "https://repo.maven.apache.org/maven2",
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  "published": "2026-08-05T07:16:38.737",
  "references": [
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      "tags": [
        "Mailing List",
        "Vendor Advisory"
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      "source": "security@apache.org"
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    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/04/30",
      "tags": [
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  "weaknesses": [
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      "source": "security@apache.org",
      "description": [
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          "value": "CWE-770"
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    {
      "lang": "en",
      "value": "An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service.\n\nThis issue affects Apache Qpid ProtonJ2: through 1.1.0.\n\nUsers are recommended to upgrade to version 1.2.0, which fixes the issue."
    }
  ],
  "lastModified": "2026-08-07T19:44:17.873",
  "configurations": [
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          "negate": false,
          "cpeMatch": [
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