VDB

RHSA-2026:54168

RHSA-2026:54168 PUBLISHED CVSS 7.5 HIGH

Record from redhat · Published August 12, 2026

A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.

Risk scores

CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

VendorProductVersions
Red Hatrhc-worker-playbook-debugsource-0:0.2.3-6.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-0:0.2.3-6.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debugsource-0:0.2.3-6.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debuginfo-0:0.2.3-6.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debuginfo-0:0.2.3-6.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debuginfo-0:0.2.3-6.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debugsource-0:0.2.3-6.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-0:0.2.3-6.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debugsource-0:0.2.3-6.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-0:0.2.3-6.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-debuginfo-0:0.2.3-6.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-0:0.2.3-6.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0
Red Hatrhc-worker-playbook-0:0.2.3-6.el10_0.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)0:0.2.3-6.el10_0

Timeline

  • Aug 12, 2026 CVE Published
  • Aug 21, 2026 CVE Updated
  • Aug 21, 2026 Distribution Patch (2 in total, the first dated here)
  • Aug 21, 2026 Security Advisory (3 in total, the first dated here)

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln RHSA-2026:54168
vulnetix vdb fixes RHSA-2026:54168

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/RHSA-2026%3A54168/fixes/registry"

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