CVE-2026-27145 Affecting go1.26-openssl-race package, versions <1.26.4-160000.1.1


Severity

Recommended
medium

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.59% (45th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-SLES1600-GO126OPENSSLRACE-17977943
  • published15 Jul 2026
  • disclosed7 Jul 2026

Introduced: 7 Jul 2026

NewCVE-2026-27145  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 go1.26-openssl-race to version 1.26.4-160000.1.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream go1.26-openssl-race package and not the go1.26-openssl-race package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

References

CVSS Base Scores

version 3.1