CVE Explorer

CVE-2026-23833

ESPHome is a system to control microcontrollers remotely through Home Automation systems. In versions 2025.9.0 through 2025.12.6, an integer overflow in the API component's protobuf decoder allows denial-of-service attacks when API encryption is not used. The bounds check `ptr + field_length > end` in `components/api/proto.cpp` can overflow when a malicious client sends a large `field_length` value. This affects all ESPHome device platforms (ESP32, ESP8266, RP2040, LibreTiny). The overflow bypas

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dca35519df7154d9a44a41ab45ac7f8836ae0c6c1291a31e4d07a1729f47f62d

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"esphome","vendor":"esphome","versions":[{"status":"affected","version":">= 2025.9.0, < 2025.12.7"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":1.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions

{"name":"https://esphome.io/guides/security_best_practices","tags":["x_refsource_MISC"],"url":"https://esphome.io/guides/security_best_practices"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/references/3

{"name":"https://github.com/esphome/esphome/commit/69d7b6e9210390051318bd8e6410727689de08d6","tags":["x_refsource_MISC"],"url":"https://github.com/esphome/esphome/commit/69d7b6e9210390051318bd8e6410727689de08d6"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/references/2

{"name":"https://github.com/esphome/esphome/pull/13306","tags":["x_refsource_MISC"],"url":"https://github.com/esphome/esphome/pull/13306"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/references/1

{"name":"https://github.com/esphome/esphome/security/advisories/GHSA-4h3h-63v6-88qx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/esphome/esphome/security/advisories/GHSA-4h3h-63v6-88qx"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6abaca88bee4bf374442344a9ffd81ecdec2bf2f97220eecb4429a830e4aad24 · sha256:b2bffedbf35b3cbb… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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