Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-5263— URI nameConstraints not enforced in ConfirmNameConstraints()

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（CyaSSL）存在安全漏洞，该漏洞源于在证书链验证期间解析但未强制执行来自受约束中间CA的URI名称约束，可能导致接受违反颁发CA名称约束的叶证书。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
wolfSSL wolfSSL < 5.9.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-5263

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
URI nameConstraints not enforced in ConfirmNameConstraints()
Source: CVE Program / CVE List V5
Vulnerability Description
URI nameConstraints from constrained intermediate CAs are parsed but not enforced during certificate chain verification in wolfcrypt/src/asn.c. A compromised or malicious sub-CA could issue leaf certificates with URI SAN entries that violate the nameConstraints of the issuing CA, and wolfSSL would accept them as valid.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL（CyaSSL） 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（CyaSSL）存在安全漏洞，该漏洞源于在证书链验证期间解析但未强制执行来自受约束中间CA的URI名称约束，可能导致接受违反颁发CA名称约束的叶证书。
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-2026-5263

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-5263

请登录查看更多情报信息。

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

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

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-295

V. Comments for CVE-2026-5263

No comments yet

Leave a comment