CVE-2026-5447
Received Received - Intake
Heap Buffer Overflow in CertFromX509 via AuthorityKeyIdentifier

Publication date: 2026-04-09

Last updated on: 2026-04-29

Assigner: wolfSSL Inc.

Description
Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.
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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-2026-5447
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 in the function CertFromX509 when handling the AuthorityKeyIdentifier extension of an X.509 certificate. The issue arises due to incorrect size handling, leading to a buffer overflow during the internal conversion of the certificate.

Impact Analysis

A heap buffer overflow can lead to memory corruption, which attackers might exploit to cause crashes, execute arbitrary code, or escalate privileges. This could compromise the security of systems processing affected X.509 certificates.

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