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CVE-2026-5246

Full vulnerability record from the local CVENow database.

Description

A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Severity
LOW
CVSS score
2.9 (v4.0)
Vulnerability status
Analyzed
Source identifier
[email protected]
Published
2026-04-02 10:16:17.763000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON 
{
  "id": "CVE-2026-5246",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-02T10:16:17.763",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."
    },
    {
      "lang": "es",
      "value": "Se determinó una vulnerabilidad en Cesanta Mongoose hasta la versión 7.20. La función afectada es mg_tls_verify_cert_signature del archivo mongoose.c del componente P-384 Public Key Gestor. Ejecutar una manipulación puede llevar a una omisión de autorización. El ataque puede ejecutarse de forma remota. Los ataques de esta naturaleza son altamente complejos. Se dice que la explotabilidad es difícil. El exploit ha sido divulgado públicamente y puede ser utilizado. La actualización a la versión 7.21 puede solucionar este problema. Este parche se llama 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. El componente afectado debe ser actualizado. Se contactó al proveedor con antelación, respondió de manera muy profesional y lanzó rápidamente una versión corregida del producto afectado."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Cesanta",
          "product": "Mongoose",
          "cpes": [
            "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "P-384 Public Key Handler"
          ],
          "versions": [
            {
              "version": "7.0",
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            },
            {
              "version": "7.1",
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            },
            {
              "version": "7.2",
              "status": "affected"
            },
            {
              "version": "7.3",
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            },
            {
              "version": "7.4",
              "status": "affected"
            },
            {
              "version": "7.5",
              "status": "affected"
            },
            {
              "version": "7.6",
              "status": "affected"
            },
            {
              "version": "7.7",
              "status": "affected"
            },
            {
              "version": "7.8",
              "status": "affected"
            },
            {
              "version": "7.9",
              "status": "affected"
            },
            {
              "version": "7.10",
              "status": "affected"
            },
            {
              "version": "7.11",
              "status": "affected"
            },
            {
              "version": "7.12",
              "status": "affected"
            },
            {
              "version": "7.13",
              "status": "affected"
            },
            {
              "version": "7.14",
              "status": "affected"
            },
            {
              "version": "7.15",
              "status": "affected"
            },
            {
              "version": "7.16",
              "status": "affected"
            },
            {
              "version": "7.17",
              "status": "affected"
            },
            {
              "version": "7.18",
              "status": "affected"
            },
            {
              "version": "7.19",
              "status": "affected"
            },
            {
              "version": "7.20",
              "status": "affected"
            },
            {
              "version": "7.21",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
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          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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    ],
    "cvssMetricV31": [
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        "type": "Primary",
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    ],
    "cvssMetricV2": [
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        "type": "Secondary",
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          "baseScore": 5.1,
          "accessVector": "NETWORK",
          "accessComplexity": "HIGH",
          "authentication": "NONE",
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "availabilityImpact": "PARTIAL"
        },
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        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
          "timestamp": "2026-04-02T13:06:36.226342Z",
          "id": "CVE-2026-5246",
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          "role": "CISA Coordinator",
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  "weaknesses": [
    {
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          "value": "CWE-285"
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        {
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  ],
  "configurations": [
    {
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          "cpeMatch": [
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              "versionEndExcluding": "7.21",
              "matchCriteriaId": "CFB6060D-2132-492F-8C8D-CC053CCFBC80"
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  ],
  "references": [
    {
      "url": "https://github.com/cesanta/mongoose/",
      "source": "[email protected]",
      "tags": [
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    },
    {
      "url": "https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1",
      "source": "[email protected]",
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      "source": "[email protected]",
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    {
      "url": "https://vuldb.com/submit/770104",
      "source": "[email protected]",
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        "Third Party Advisory",
        "VDB Entry"
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    {
      "url": "https://vuldb.com/vuln/354827",
      "source": "[email protected]",
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        "Third Party Advisory",
        "VDB Entry"
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    {
      "url": "https://vuldb.com/vuln/354827/cti",
      "source": "[email protected]",
      "tags": [
        "Permissions Required",
        "VDB Entry"
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}