crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application

A flaw was found in the crypto/x509 package within Go golang. When verifying a certificate chain, excluded DNS Domain Name System constraints are not correctly applied to wildcard DNS Subject Alternative Names SANs if the case of the SAN differs from the constraint. This oversight could allow an...

CVE-2026-27145 Inefficient candidate hostname parsing in crypto/x509

x509.Certificate.VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name SAN entries. This caused strings.Splithost, "." to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number...

BIT-GOLANG-2026-27137 Incorrect enforcement of email constraints in crypto/x509

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered...

ROS-20260209-73-0028

A vulnerability in the crypto-x509 component of the Go programming language is associated with uncontrolled resource consumption. Exploitation of the vulnerability could allow an attacker acting remotely to cause a denial of service...

RLSA-2026:1518 Important: grafana-pcp security update

The Grafana plugin for Performance Co-Pilot includes datasources for scalable time series from pmseries and Redis, live PCP metrics and bpftrace scripts from pmdabpftrace, as well as several dashboards. Security Fixes: crypto/x509: golang: Denial of Service due to excessive resource consumption v...

Google Go 安全漏洞

Google Go is a static strongly typed, compiled, concatenated, and garbage-collected programming language from Google USA. A security vulnerability exists in Google Go that stems from a subdomain constraint excluded from the crypto/x509 certificate chain that does not restrict the use of the...

Google Go 安全漏洞

Google Go is a static strongly typed, compiled, concatenated, and garbage-collected programming language from Google, Inc. A security vulnerability exists in Google Go that stems from the HostnameError.Error function in package crypto/x509 constructing an error string without limiting the number ...

golang: math/big: panic during recursive division of very large numbers

A flaw was found in the math/big package of Go's standard library that causes a denial of service. Applications written in Go that use math/big via cryptographic packages, including crypto/rsa and crypto/x509, are vulnerable and can potentially cause panic via a crafted certificate chain. The...