CVE-2026-5460— Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3
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TLS 1.3后量子密码学混合密钥共享处理中存在堆释放后重用，可能导致错误处理路径中对已释放内存进行写操作。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5460
Vulnerability Information
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Vulnerability Title
Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3
Source: CVE Program / CVE List V5
Vulnerability Description
A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
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TLS 1.3后量子密码学混合密钥共享处理中存在堆释放后重用，可能导致错误处理路径中对已释放内存进行写操作。
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-2026-5460
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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-2026-5503 | 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
-
CVE-2026-15442
Heap use-after-free on read during bidirectional (D)TLS shut -
CVE-2026-89102
OCSP stapling v2 multi accepts non-CA chain certificates as -
CVE-2026-89133
NameConstraints not enforced across unconstrained intermedia -
CVE-2026-89134
Subject CN name-constraint check bypassed when non-DNS SAN p -
CVE-2026-89135
Failed X509_verify_cert leaves unverified CA in shared CertM
Same vendor: wolfSSL
-
CVE-2026-15442
Heap use-after-free on read during bidirectional (D)TLS shut -
CVE-2026-89102
OCSP stapling v2 multi accepts non-CA chain certificates as -
CVE-2026-89133
NameConstraints not enforced across unconstrained intermedia -
CVE-2026-89134
Subject CN name-constraint check bypassed when non-DNS SAN p -
CVE-2026-89135
Failed X509_verify_cert leaves unverified CA in shared CertM
Same weakness: CWE-416
V. Comments for CVE-2026-5460
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