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N A CVE-2026-51263

| EUVDEUVD-2026-49863 CRITICAL
Heap-based Buffer Overflow (CWE-122)
2026-07-28 mitre GHSA-gx43-j5rw-hx63
9.8
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Jul 28, 2026 - 19:30 vuln.today
CVE Published
Jul 28, 2026 - 00:00 cve.org
CRITICAL 9.8
CVE Published
Jul 28, 2026 - 00:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

schreibfaul1 ESP32-audioI2S 3.4.5 is vulnerable to Buffer Overflow. The Audio::openai_speech function in the Audio library manually constructs JSON request bodies and HTTP request headers by directly concatenating externally controllable input and instructions strings without effective length restriction and boundary validation. An unauthenticated remote attacker can send oversized malicious string data to trigger a heap buffer overflow during string splicing, resulting in memory corruption.

AnalysisAI

A heap-based buffer overflow in ESP32-audioI2S library version 3.4.5 allows remote unauthenticated attackers to crash or potentially execute arbitrary code on vulnerable ESP32 devices. The flaw exists in the Audio::openai_speech function, which manually constructs JSON/HTTP payloads by concatenating user input without length checks. A proof-of-concept exploit is publicly available, but no active exploitation has been confirmed.

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CVE-2026-51263 vulnerability details – vuln.today

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