CVE-2026-27145
EUVD-2026-3403802.06.2026, 23:16
(*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.Enginsight
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:0.152.1-1.el10_2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 10 | 0:0.9.27-7.el10_2.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 10 | 1:0.3.8-6.el10_2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 10 | 0:0.4.9.2-1.el10_2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8 | 8100020260710105056.a3795dee ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 0:1.26.4-1.el9_8 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 0:0.152.1-1.el9_8 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 2:1.22.2-7.el9_8 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 1:0.2.7-8.el9_8 ≤ 𝑥 < * | ADP |
| Red Hat | Multicluster Global Hub 1.4.5 | 1784061472 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Developer Hub 1.9 | 1782767215 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Hardened Images | 1.25.11-2.hum1 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Hardened Images | 1.26.4-2.hum1 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat OpenShift Builds 1.7.4 | 1783057868 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat OpenShift Builds 1.8.1 | 1784121108 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat OpenShift Builds 1.8.1 | 1783612119 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Trusted Artifact Signer 1.4 | 4-1.4.2 ≤ 𝑥 < * | ADP |
Debian Releases
Red Hat Enterprise Linux Releases
Red Hat Product | |||
|---|---|---|---|
| go-toolset |
| ||
| golang |
| ||
| golang-bin |
| ||
| golang-docs |
| ||
| golang-misc |
| ||
| golang-race |
| ||
| golang-src |
| ||
| golang-tests |
| ||
| opentelemetry-collector |
| ||
| rhc |
| ||
| rhc-devel |
| ||
| skopeo |
| ||
| skopeo-tests |
|
Amazon Linux Releases
Amazon Package | |||||
|---|---|---|---|---|---|
| compat-golang-github-cpuguy83-md2man-2-devel |
| ||||
| containerd |
| ||||
| containerd-debuginfo |
| ||||
| containerd-debugsource |
| ||||
| containerd-stress |
| ||||
| containerd-stress-debuginfo |
| ||||
| credentials-fetcher |
| ||||
| docker |
| ||||
| docker-debuginfo |
| ||||
| docker-debugsource |
| ||||
| ecs-init |
| ||||
| golang |
| ||||
| golang-bin |
| ||||
| golang-docs |
| ||||
| golang-github-burntsushi-toml |
| ||||
| golang-github-burntsushi-toml-debuginfo |
| ||||
| golang-github-burntsushi-toml-debugsource |
| ||||
| golang-github-burntsushi-toml-devel |
| ||||
| golang-github-burntsushi-toml-test |
| ||||
| golang-github-burntsushi-toml-test-debuginfo |
| ||||
| golang-github-burntsushi-toml-test-debugsource |
| ||||
| golang-github-burntsushi-toml-test-devel |
| ||||
| golang-github-cpuguy83-md2man |
| ||||
| golang-github-cpuguy83-md2man-debuginfo |
| ||||
| golang-github-cpuguy83-md2man-debugsource |
| ||||
| golang-github-cpuguy83-md2man-devel |
| ||||
| golang-misc |
| ||||
| golang-shared |
| ||||
| golang-src |
| ||||
| golang-tests |
| ||||
| golist |
| ||||
| golist-debuginfo |
| ||||
| golist-debugsource |
| ||||
| nerdctl |
| ||||
| nerdctl-debuginfo |
| ||||
| soci-snapshotter |
|
Common Weakness Enumeration
Vulnerability Media Exposure
References