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CVE-2026-5448— 1-2 Byte Buffer Overflow in wolfSSL_X509_notAfter/notBefore

Quick assessment

Affected
wolfSSL wolfSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞，该漏洞源于解析X.509证书日期字段时存在缓冲区溢出，可能导致通过兼容层API调用时触发缓冲区溢出。

AI Predicted 7.5 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5448

Vulnerability Information
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Vulnerability Title
1-2 Byte Buffer Overflow in wolfSSL_X509_notAfter/notBefore
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞，该漏洞源于解析X.509证书日期字段时存在缓冲区溢出，可能导致通过兼容层API调用时触发缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 0 ~ 5.9.1 -

II. Public POCs for CVE-2026-5448

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III. Intelligence Information for CVE-2026-5448

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Patches & Fixes for CVE-2026-5448 (1)

Same Patch Batch · wolfSSL · 2026-04-09 · 16 CVEs total

CVE-2026-5263 URI nameConstraints not enforced in ConfirmNameConstraints()
CVE-2026-5187 Heap Out-of-Bounds Write in DecodeObjectId() in wolfSSL
CVE-2026-5264 DTLS 1.3 ACK heap buffer overflow
CVE-2026-5295 Stack Buffer Overflow in wolfSSL PKCS7 wc_PKCS7_DecryptOri() via Oversized OID
CVE-2026-5393 OOB Read in DoTls13CertificateVerify with WOLFSSL_DUAL_ALG_CERTS
CVE-2026-5446 wolfSSL ARIA-GCM TLS 1.2/DTLS 1.2 GCM nonce reuse
CVE-2026-5504 PKCS7 CBC Padding Oracle — Plaintext Recovery
CVE-2026-5447 Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier
CVE-2026-5778 Integer underflow leads to out-of-bounds access in sniffer ChaCha decrypt path.
CVE-2026-5772 MatchDomainName 1-Byte Stack Buffer Over-Read in Hostname Validation
CVE-2026-5507 Session Cache Restore — Arbitrary Free via Deserialized Pointer
CVE-2026-5194 wolfSSL ECDSA Certificate Verification
CVE-2026-5392 wolfSSL heap OOB read in PKCS7 SignedData streaming
CVE-2026-5460 Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3
CVE-2026-5503 out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-122

V. Comments for CVE-2026-5448

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