CVE-2026-5447 PUBLISHED

Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier

Assigner: wolfSSL
Reserved: 02.04.2026 Published: 09.04.2026 Updated: 09.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 0 to 5.9.1 (excl.)

Credits

Calif.io in collaboration with Claude and Anthropic Research finder

References

https://github.com/wolfSSL/wolfssl/pull/10112

Problem Types

CWE-122 Heap-based Buffer Overflow CWE