CVE-2026-5264
Received Received - Intake
Heap Buffer Overflow in DTLS 1.3 ACK Message Processing

Publication date: 2026-04-09

Last updated on: 2026-04-29

Assigner: wolfSSL Inc.

Description
Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow.
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Meta Information
Published
2026-04-09
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-04-10
EPSS Evaluated
2026-06-14
NVD
CVE-2026-5264
EUVD
EUVD-2026-21214
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wolfssl wolfssl to 5.9.1 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability is a heap buffer overflow that occurs during the processing of DTLS 1.3 ACK messages. A remote attacker can send a specially crafted DTLS 1.3 ACK message which triggers this overflow, potentially causing unexpected behavior or crashes.

Impact Analysis

The heap buffer overflow caused by this vulnerability can lead to serious impacts such as remote code execution, denial of service, or system crashes. Since the attacker can trigger this remotely without authentication, it poses a significant security risk.

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