{"id":"CVE-2026-34118","title":"A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, C520WS v2.6 in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to insufficient …","summary":"A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, C520WS v2.6 in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to insufficient …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-122"],"vendor":"tp-link","product":"tapo_c520ws_firmware","affected":["tapo_c520ws_firmware < 1.2.4"],"patched":["tapo_c520ws_firmware 1.2.4"],"published":"2026-04-02","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-34118","references":[{"url":"https://www.tp-link.com/en/support/download/tapo-c100/v5/#Firmware-Release-Notes","label":"f23511db-6c3e-4e32-a477-6aa17d310630"},{"url":"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes","label":"f23511db-6c3e-4e32-a477-6aa17d310630"},{"url":"https://www.tp-link.com/us/support/download/tapo-c100/v5/#Firmware-Release-Notes","label":"f23511db-6c3e-4e32-a477-6aa17d310630"},{"url":"https://www.tp-link.com/us/support/download/tapo-c101/v5/#Firmware-Release-Notes","label":"f23511db-6c3e-4e32-a477-6aa17d310630"},{"url":"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes","label":"f23511db-6c3e-4e32-a477-6aa17d310630"},{"url":"https://www.tp-link.com/us/support/faq/5047/","label":"f23511db-6c3e-4e32-a477-6aa17d310630"}],"tags":["nvd"],"epss":0.0037,"epssPercentile":0.30714,"ingestedAt":"2026-08-20T17:59:04.705Z","slug":"CVE-2026-34118","body":"## Overview\n\nA heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, 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.  \n\nAn attacker\non the same network segment could trigger heap memory corruption conditions by\nsending crafted payloads that cause write operations beyond allocated buffer\nboundaries.  Successful exploitation\ncauses a Denial-of-Service (DoS) condition, causing the device’s process to\ncrash or become unresponsive.\n\n## Affected\n\n- `tapo_c520ws_firmware < 1.2.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `tapo_c520ws_firmware 1.2.4`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}