CVE-2026-5448 PUBLISHED

1-2 Byte Buffer Overflow in wolfSSL_X509_notAfter/notBefore

Assigner: wolfSSL
Reserved: 02.04.2026 Published: 09.04.2026 Updated: 10.04.2026

X.509 date buffer overflow in wolfSSL_X509_notAfter / wolfSSL_X509_notBefore. A buffer overflow may occur when parsing date fields from a crafted X.509 certificate via the compatibility layer API. This is only triggered when calling these two APIs directly from an application, and does not affect TLS or certificate verify operations in wolfSSL.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Green
CVSS Score: 2.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	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

Sunwoo Lee, Korea Institute of Energy Technology (KENTECH) finder
Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH) finder

References

https://github.com/wolfSSL/wolfssl/pull/10071

Problem Types

CWE-122 Heap-based Buffer Overflow CWE