Unchecked Input for Loop Condition Affecting golang-misc package, versions <0:1.26.4-1.el9_8


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.59% (45th percentile)

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  • Snyk IDSNYK-RHEL9-GOLANGMISC-17907544
  • published9 Jul 2026
  • disclosed2 Jun 2026

Introduced: 2 Jun 2026

CVE-2026-27145  (opens in a new tab)
CWE-606  (opens in a new tab)

How to fix?

Upgrade RHEL:9 golang-misc to version 0:1.26.4-1.el9_8 or higher.
This issue was patched in RHSA-2026:29981.

NVD Description

Note: Versions mentioned in the description apply only to the upstream golang-misc package and not the golang-misc package as distributed by RHEL. See How to fix? for RHEL:9 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.

CVSS Base Scores

version 3.1