CVE-2026-71260

ESPHome through 2026.7.0-dev discloses plaintext passwords via its webserver component. In WebServer::textjson esphome/components/webserver/webserver.cpp, a text entity configured with mode: password TEXTMODEPASSWORD has its JSON "state" field correctly masked as "", but the same serialization pa...

CVE-2026-71259

ESPHome through 2026.7.0-dev contains an operator-precedence bug in the cv.url validator in esphome/configvalidation.py: if parsed.scheme and parsed.netloc or parsed.scheme == "file": return parsed.geturl. Because and binds tighter than or, any file: URI passes validation regardless of netloc. Th...

CVE-2026-71260 ESPHome web_server Plaintext Password Disclosure via JSON "value" Field

ESPHome through 2026.7.0-dev discloses plaintext passwords via its webserver component. In WebServer::textjson esphome/components/webserver/webserver.cpp, a text entity configured with mode: password TEXTMODEPASSWORD has its JSON "state" field correctly masked as "", but the same serialization pa...

CVE-2026-71260 ESPHome web_server Plaintext Password Disclosure via JSON "value" Field

ESPHome through 2026.7.0-dev discloses plaintext passwords via its webserver component. In WebServer::textjson esphome/components/webserver/webserver.cpp, a text entity configured with mode: password TEXTMODEPASSWORD has its JSON "state" field correctly masked as "", but the same serialization pa...

EUVD-2026-53345

ESPHome through 2026.7.0-dev discloses plaintext passwords via its webserver component. In WebServer::textjson esphome/components/webserver/webserver.cpp, a text entity configured with mode: password TEXTMODEPASSWORD has its JSON "state" field correctly masked as "", but the same serialization pa...

CVE-2026-71260

CVE-2026-71260 affects ESPHome up to 2026.7.0-dev. In the web_server component, a text entity with mode: password correctly masks the TEXT field in the JSON 'state', but the serialization path unconditionally writes the raw password into the JSON 'value' field via set_json_icon_state_value()/set_...

CVE-2026-71259

ESPHome (up to 2026.7.0-dev) is affected by an operator-precedence bug in the cv.url() validator within esphome/config_validation.py. The condition if parsed.scheme and parsed.netloc or parsed.scheme == "file" incorrectly permits file:// URIs to bypass validation, affecting the url: field of the ...

CVE-2026-71259 ESPHome external_components file:// Scheme Validation Bypass Leading to Remote Code Execution

ESPHome through 2026.7.0-dev contains an operator-precedence bug in the cv.url validator in esphome/configvalidation.py: if parsed.scheme and parsed.netloc or parsed.scheme == "file": return parsed.geturl. Because and binds tighter than or, any file: URI passes validation regardless of netloc. Th...

CVE-2026-71259 ESPHome external_components file:// Scheme Validation Bypass Leading to Remote Code Execution

ESPHome through 2026.7.0-dev contains an operator-precedence bug in the cv.url validator in esphome/configvalidation.py: if parsed.scheme and parsed.netloc or parsed.scheme == "file": return parsed.geturl. Because and binds tighter than or, any file: URI passes validation regardless of netloc. Th...

EUVD-2026-53344

ESPHome through 2026.7.0-dev contains an operator-precedence bug in the cv.url validator in esphome/configvalidation.py: if parsed.scheme and parsed.netloc or parsed.scheme == "file": return parsed.geturl. Because and binds tighter than or, any file: URI passes validation regardless of netloc. Th...

PYSEC-2026-1326 ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component

Summary An integer overflow in the API component's protobuf decoder allows denial-of-service attacks when API encryption is not used. Details The bounds check ptr + fieldlength end in components/api/proto.cpp can overflow when a malicious client sends a large fieldlength value. This affects all...

PYSEC-2026-1327 ESPHome vulnerable to Authentication bypass via Cross site request forgery

Summary API endpoints in dashboard component of ESPHome version 2023.12.9 command line installation are vulnerable to Cross-Site Request Forgery CSRF allowing remote attackers to carry out attacks against a logged user of the dashboard to perform operations on configuration files create, edit,...

PYSEC-2026-1329 esphome vulnerable to stored Cross-site Scripting in edit configuration file API

Summary Edit configuration file API in dashboard component of ESPHome version 2023.12.9 command line installation and Home Assistant add-on serves unsanitized data with “Content-Type: text/html; charset=UTF-8”, allowing remote authenticated user to inject arbitrary web script and exfiltrate sessi...

PYSEC-2026-1328 ESPHome vulnerable to remote code execution via arbitrary file write

Summary Security misconfiguration in edit configuration file API in dashboard component of ESPHome version 2023.12.9 command line installation allows authenticated remote attackers to read and write arbitrary files under the configuration directory rendering remote code execution possible. Detail...

aksharify (=0.2.0), buildbot-badges (>=1.7.0 <=1.8.2) +51 more potentially affected by CVE-2026-31899 via cairosvg (>=0.5.0 <=2.8.2)

cairosvg PYPI version =0.5.0, =1.7.0, =0.1.0, =0.20.7, =1.0.0b1, =0.0.2, =2025.5.0, =1.0.0, =0.1.0, =1.3.6, =0.2.2, =0.2.32 and more Source cves: CVE-2026-31899 Source advisory: OSV:GHSA-F38F-5XPM-9R7C...

Denial-Of-Service (DoS)

ESPHome is vulnerable to a Denial-Of-Service DoS. The vulnerability is due to an integer overflow in the API protobuf decoder, where an attacker-controlled fieldlength value can overflow the bounds check in proto.cpp, bypassing validation and causing invalid memory access that crashes the device,...

EUVD-2026-3306

ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component...

GHSA-4H3H-63V6-88QX ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component

Summary An integer overflow in the API component's protobuf decoder allows denial-of-service attacks when API encryption is not used. Details The bounds check ptr + fieldlength end in components/api/proto.cpp can overflow when a malicious client sends a large fieldlength value. This affects all...

CVE-2026-23833

A flaw was found in ESPHome. An integer overflow vulnerability exists in the API component's protobuf decoder. A remote attacker can exploit this by sending a specially crafted, large fieldlength value, which bypasses a bounds check. This can lead to a denial-of-service DoS condition, causing the...

Integer Overflow or Wraparound

Overview esphome is a Make creating custom firmwares for ESP32/ESP8266 super easy. Affected versions of this package are vulnerable to Integer Overflow or Wraparound via the protobuf decoder in the API component. An attacker can cause the device to read invalid memory and crash by sending a...