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CVE-2026-46430

Status: DeferredMedium (4.3)—

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort("", ":5553") resolves to ":5553". This vulnerability is fixed in 1.17.7.

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)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Algernon — AlgernonAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-46430",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-46430",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-26T18:57:07.427124Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "xyproto",
          "product": "algernon",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.17.7"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-26T17:16:50.943",
  "references": [
    {
      "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-668"
        },
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = \"\" for non-Windows, and utils.JoinHostPort(\"\", \":5553\") resolves to \":5553\". This vulnerability is fixed in 1.17.7."
    },
    {
      "lang": "es",
      "value": "Algernon es un pequeño servidor web autocontenido y puro Go. Antes de la versión 1.17.7, el servidor de eventos SSE se enlazaba a 0.0.0.0:5553 en Linux/macOS por defecto porque el valor predeterminado del host dependiente de la plataforma en engine/flags.go:39-46 establecía host = \"\" para sistemas que no eran Windows, y utils.JoinHostPort(\"\", \":5553\") se resuelve como \":5553\". Esta vulnerabilidad se corrige en la versión 1.17.7."
    }
  ],
  "lastModified": "2026-07-24T11:10:00.170",
  "sourceIdentifier": "security-advisories@github.com"
}