FKIE_CVE-2025-11679

Vulnerability from fkie_nvd - Published: 2025-10-20 14:15 - Updated: 2026-10-08 22:10
Severity
5.9 (Medium) - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big height dimension.
References
prodsec@nozominetworks.comhttps://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101
prodsec@nozominetworks.comhttps://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://libwebsockets.org/git/libwebsockets",
          "defaultStatus": "unaffected",
          "modules": [
            "lws_upng_emit_next_line"
          ],
          "product": "libwebsockets",
          "vendor": "warmcat",
          "versions": [
            {
              "lessThanOrEqual": "4.4.2",
              "status": "affected",
              "version": "4.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.3.6",
              "status": "affected",
              "version": "4.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "prodsec@nozominetworks.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big height dimension."
    },
    {
      "lang": "es",
      "value": "Lectura fuera de l\u00edmites en lws_upng_emit_next_line en warmcat libwebsockets permite, cuando la bandera LWS_WITH_UPNG est\u00e1 habilitada durante la compilaci\u00f3n y se utiliza la pila de visualizaci\u00f3n HTML, leer m\u00e1s all\u00e1 de un b\u00fafer asignado en el mont\u00f3n, posiblemente causando un fallo, cuando el usuario visita un sitio web controlado por un atacante que contiene un archivo PNG manipulado con una gran dimensi\u00f3n de altura."
    }
  ],
  "id": "CVE-2025-11679",
  "lastModified": "2026-10-08T22:10:00.563",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "prodsec@nozominetworks.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-11679",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-10-20T14:02:56.942722Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-20T14:15:40.353",
  "references": [
    {
      "source": "prodsec@nozominetworks.com",
      "url": "https://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101"
    },
    {
      "source": "prodsec@nozominetworks.com",
      "url": "https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679"
    }
  ],
  "sourceIdentifier": "prodsec@nozominetworks.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "prodsec@nozominetworks.com",
      "type": "Secondary"
    }
  ]
}



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