Vulnerability · Published Jun 25, 2026 · Assigned by wolfSSL
CVE-2026-10592Wildcard DNS SAN bypasses CA name-constraint checks
Medium 6.3
In plain English
A medium-severity improper certificate validation 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). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.2%top 90.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Certificates with wildcard DNS SANs (e.g. *.example.com) bypassed CA name-constraint checks. A certificate with a wildcard DNS SAN that should be rejected by the issuing CA's permitted/excluded DNS name constraints could be accepted.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | wolfssl | 5.9.2-r0 | ALPINE-CVE-2026-10592 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-10592 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-10592 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-10592 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-10592 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-10592 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-10592 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-10592 |
Affected products (as reported)
Weakness: CWE-295 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N