CVE-2026-27145 Affecting go-toolset:rhel8/go-toolset package, versions <0:1.26.5-1.module_el8.10.0+4223+bd807c2e


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.59% (45th percentile)

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  • Snyk IDSNYK-ALMALINUX8-GOTOOLSET-17976983
  • published15 Jul 2026
  • disclosed14 Jul 2026

Introduced: 14 Jul 2026

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

How to fix?

Upgrade AlmaLinux:8 go-toolset:rhel8/go-toolset to version 0:1.26.5-1.module_el8.10.0+4223+bd807c2e or higher.
This issue was patched in ALSA-2026:38995.

NVD Description

Note: Versions mentioned in the description apply only to the upstream go-toolset:rhel8/go-toolset package and not the go-toolset:rhel8/go-toolset package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 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