CVE-2026-34118 (GCVE-0-2026-34118)

Vulnerability from cvelistv5 – Published: 2026-04-02 17:19 – Updated: 2026-04-02 17:48
VLAI
Title
Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS
Summary
A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to insufficient boundary validation when handling externally supplied HTTP input.  An attacker on the same network segment could trigger heap memory corruption conditions by sending crafted payloads that cause write operations beyond allocated buffer boundaries.  Successful exploitation causes a Denial-of-Service (DoS) condition, causing the device’s process to crash or become unresponsive.
Severity
7.1 (High)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-122 - Heap-based buffer overflow
Assigner
References
Impacted products
Vendor Product Version
TP-Link Systems Inc. Tapo C520WS v2.6 Affected: 0 , < 1.2.4 Build 260326 Rel.24666n (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34118",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-02T17:48:35.729427Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-02T17:48:43.255Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "HTTP POST"
          ],
          "product": "Tapo C520WS v2.6",
          "vendor": "TP-Link Systems Inc.",
          "versions": [
            {
              "lessThan": "1.2.4 Build 260326 Rel.24666n",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6\u0026nbsp;in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to\u0026nbsp;insufficient boundary validation when handling externally supplied HTTP input.\u0026nbsp;\u0026nbsp;\u003cdiv\u003e\u003cp\u003eAn attacker\non the same network segment could trigger heap memory corruption conditions by\nsending crafted payloads that cause write operations beyond allocated buffer\nboundaries.\u0026nbsp; Successful exploitation\ncauses a Denial-of-Service (DoS) condition, causing the device\u2019s process to\ncrash or become unresponsive.\u003c/p\u003e\u003c/div\u003e"
            }
          ],
          "value": "A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6\u00a0in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to\u00a0insufficient boundary validation when handling externally supplied HTTP input.\u00a0\u00a0An attacker\non the same network segment could trigger heap memory corruption conditions by\nsending crafted payloads that cause write operations beyond allocated buffer\nboundaries.\u00a0 Successful exploitation\ncauses a Denial-of-Service (DoS) condition, causing the device\u2019s process to\ncrash or become unresponsive."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-100",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-100 Overflow Buffers"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122 Heap-based buffer overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-02T17:19:43.453Z",
        "orgId": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "shortName": "TPLink"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.tp-link.com/us/support/faq/5047/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f23511db-6c3e-4e32-a477-6aa17d310630",
    "assignerShortName": "TPLink",
    "cveId": "CVE-2026-34118",
    "datePublished": "2026-04-02T17:19:43.453Z",
    "dateReserved": "2026-03-25T18:54:03.343Z",
    "dateUpdated": "2026-04-02T17:48:43.255Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-34118",
      "date": "2026-08-05",
      "epss": "0.00259",
      "percentile": "0.17419"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-34118\",\"sourceIdentifier\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"published\":\"2026-04-02T18:16:28.503\",\"lastModified\":\"2026-07-24T21:10:00.143\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6\u00a0in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to\u00a0insufficient boundary validation when handling externally supplied HTTP input.\u00a0\u00a0An attacker\\non the same network segment could trigger heap memory corruption conditions by\\nsending crafted payloads that cause write operations beyond allocated buffer\\nboundaries.\u00a0 Successful exploitation\\ncauses a Denial-of-Service (DoS) condition, causing the device\u2019s process to\\ncrash or become unresponsive.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de desbordamiento de b\u00fafer basado en mont\u00edculo fue identificada en TP-Link Tapo C520WS v2.6 en la l\u00f3gica de an\u00e1lisis del cuerpo HTTP POST debido a la falta de validaci\u00f3n de la capacidad restante del b\u00fafer despu\u00e9s de la asignaci\u00f3n din\u00e1mica, debido a una validaci\u00f3n de l\u00edmites insuficiente al manejar entrada HTTP suministrada externamente. Un atacante en el mismo segmento de red podr\u00eda desencadenar condiciones de corrupci\u00f3n de memoria del mont\u00edculo al enviar cargas \u00fatiles manipuladas que causan operaciones de escritura m\u00e1s all\u00e1 de los l\u00edmites del b\u00fafer asignado. La explotaci\u00f3n exitosa causa una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS), haciendo que el proceso del dispositivo se bloquee o deje de responder.\"}],\"affected\":[{\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"affectedData\":[{\"vendor\":\"TP-Link Systems Inc.\",\"product\":\"Tapo C520WS v2.6\",\"defaultStatus\":\"unaffected\",\"modules\":[\"HTTP POST\"],\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.2.4 Build 260326 Rel.24666n\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/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\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"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\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-04-02T17:48:35.729427Z\",\"id\":\"CVE-2026-34118\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-122\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.2.4\",\"matchCriteriaId\":\"710DD89A-E94F-4371-A03F-698C2F61D9C1\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"72666951-E72F-4494-9A90-1F0B22E2F3CD\"}]}]}],\"references\":[{\"url\":\"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes\",\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes\",\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://www.tp-link.com/us/support/faq/5047/\",\"source\":\"f23511db-6c3e-4e32-a477-6aa17d310630\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-04-03T23:01:56+00:00",
      "cve": "CVE-2026-34118",
      "id": "CVE-2026-34118",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34118.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-34118\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-02T17:48:35.729427Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-02T17:48:38.574Z\"}}], \"cna\": {\"title\": \"Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"impacts\": [{\"capecId\": \"CAPEC-100\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-100 Overflow Buffers\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 7.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"ADJACENT\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"TP-Link Systems Inc.\", \"modules\": [\"HTTP POST\"], \"product\": \"Tapo C520WS v2.6\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.2.4 Build 260326 Rel.24666n\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes\", \"tags\": [\"patch\"]}, {\"url\": \"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes\", \"tags\": [\"patch\"]}, {\"url\": \"https://www.tp-link.com/us/support/faq/5047/\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6\\u00a0in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to\\u00a0insufficient boundary validation when handling externally supplied HTTP input.\\u00a0\\u00a0An attacker\\non the same network segment could trigger heap memory corruption conditions by\\nsending crafted payloads that cause write operations beyond allocated buffer\\nboundaries.\\u00a0 Successful exploitation\\ncauses a Denial-of-Service (DoS) condition, causing the device\\u2019s process to\\ncrash or become unresponsive.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6\u0026nbsp;in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to\u0026nbsp;insufficient boundary validation when handling externally supplied HTTP input.\u0026nbsp;\u0026nbsp;\u003cdiv\u003e\u003cp\u003eAn attacker\\non the same network segment could trigger heap memory corruption conditions by\\nsending crafted payloads that cause write operations beyond allocated buffer\\nboundaries.\u0026nbsp; Successful exploitation\\ncauses a Denial-of-Service (DoS) condition, causing the device\\u2019s process to\\ncrash or become unresponsive.\u003c/p\u003e\u003c/div\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-122\", \"description\": \"CWE-122 Heap-based buffer overflow\"}]}], \"providerMetadata\": {\"orgId\": \"f23511db-6c3e-4e32-a477-6aa17d310630\", \"shortName\": \"TPLink\", \"dateUpdated\": \"2026-04-02T17:19:43.453Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-34118\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-02T17:48:43.255Z\", \"dateReserved\": \"2026-03-25T18:54:03.343Z\", \"assignerOrgId\": \"f23511db-6c3e-4e32-a477-6aa17d310630\", \"datePublished\": \"2026-04-02T17:19:43.453Z\", \"assignerShortName\": \"TPLink\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.