CVE-2026-5188— Integer underflow in X.509 SAN parsing in wolfSSL
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I. Basic Information for CVE-2026-5188
Vulnerability Information
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Vulnerability Title
Integer underflow in X.509 SAN parsing in wolfSSL
Source: NVD (National Vulnerability Database)
Vulnerability Description
An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name (SAN) extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal length counter to wrap during parsing. This results in incorrect handling of certificate data. The issue is limited to configurations using the original ASN.1 parsing implementation which is off by default.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
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证书时存在整数下溢问题，可能导致证书数据处理不当。
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
II. Public POCs for CVE-2026-5188
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Same Patch Batch · wolfSSL · 2026-04-10 · 6 CVEs total
| CVE-2026-5479 | wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag | |
| CVE-2026-5466 | wc_VerifyEccsiHash missing sanity check | |
| CVE-2026-5501 | Improper Certificate Signature Verification in X.509 Chain Validation Allows Forged Leaf C | |
| CVE-2026-5477 | Prefix-substitution forgery via integer overflow in wolfCrypt CMAC | |
| CVE-2026-5500 | Improper Validation of AES-GCM Authentication Tag Length in PKCS#7 Envelope Allows Authent |
IV. Related Vulnerabilities
Same product: wolfSSL
- CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V - CVE-2026-5466
wc_VerifyEccsiHash missing sanity check - CVE-2026-5479
wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag
Same vendor: wolfSSL
- CVE-2026-0930
Potential wolfSSHd Buffer out-of-bounds Read on Windows Hand - CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V - CVE-2026-5466
wc_VerifyEccsiHash missing sanity check
Same weakness: CWE-191
- CVE-2026-7736
osrg GoBGP mrt.go parseRibEntry integer underflow - CVE-2026-33845
Gnutls: gnutls: denial of service via dtls zero-length fragm - CVE-2026-7424
Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Pl - CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS- - CVE-2026-6914
MD5 checksum creation may cause availability loss
V. Comments for CVE-2026-5188
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