Vulnerability · Published Apr 9, 2026 · Assigned by wolfSSL
CVE-2026-5393OOB Read in DoTls13CertificateVerify with WOLFSSL_DUAL_ALG_CERTS
Medium 6.3
In plain English
A medium-severity out-of-bounds read in wolfSSL from wolfSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.2%top 89.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-5393 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-5393 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5393 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5393 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5393 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5393 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5393 |
Affected products (as reported)
Weakness: CWE-125 · Vector: 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