VDB
RHSA-2026:51187
RHSA-2026:51187
PUBLISHED
CVSS 8.199999809265137 HIGH
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
8.199999809265137
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | yggdrasil-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-devel-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-0:0.4.7-5.el10_0.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-examples-debuginfo-0:0.4.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debugsource-0:0.4.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-examples-debuginfo-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debugsource-0:0.4.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-devel-0:0.4.7-5.el10_0.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-examples-debuginfo-0:0.4.7-5.el10_0.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debugsource-0:0.4.7-5.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-examples-debuginfo-0:0.4.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-0:0.4.7-5.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debuginfo-0:0.4.7-5.el10_0.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
| Red Hat | yggdrasil-debugsource-0:0.4.7-5.el10_0.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | 0.4.7-5.el10, 0.4.7-5.el10 |
…and 15 more
Timeline
- Aug 6, 2026 CVE Published
- Aug 21, 2026 CVE Updated
- Aug 21, 2026 Distribution Patch
- Aug 21, 2026 Distribution Patch
- Aug 21, 2026 Security Advisory
- Aug 21, 2026 Security Advisory
- Aug 21, 2026 Security Advisory
- Aug 21, 2026 Security Advisory
References
- https://access.redhat.com/errata/RHSA-2026:51187 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2467822 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2480756 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2484207 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_51187.json advisory
- https://access.redhat.com/security/cve/CVE-2026-27145 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-27145 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-27145 advisory
- https://go.dev/cl/783621 advisory
- https://go.dev/issue/79694 advisory
- https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw advisory
- https://pkg.go.dev/vuln/GO-2026-5037 advisory
- https://access.redhat.com/security/cve/CVE-2026-33811 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-33811 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-33811 advisory
- https://go.dev/cl/767860 advisory
- https://go.dev/issue/78803 advisory
- https://groups.google.com/g/golang-announce/c/qcCIEXso47M advisory
- https://pkg.go.dev/vuln/GO-2026-4981 advisory
…and 7 more