Critical severity · published Apr 9, 2026
CVE-2026-5393
OOB Read in DoTls13CertificateVerify with WOLFSSL_DUAL_ALG_CERTS
9.1
CVSS
0.2%
EPSS
No
On KEV
Description
Dual-Algorithm CertificateVerify out-of-bounds read. When processing a dual-algorithm CertificateVerify message, an out-of-bounds read can occur on crafted input. This can only occur when --enable-experimental and --enable-dual-alg-certs is used when building wolfSSL.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WO
wolfSSL · wolfSSL
before 5.9.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5393
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5393
Issue Tracking
https://github.com/wolfSSL/wolfssl/pull/10079
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