{"id":"CVE-2026-32281","aliases":["GO-2026-4946","BIT-golang-2026-32281"],"title":"Inefficient policy validation in crypto/x509","summary":"Inefficient policy validation in crypto/x509","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"stdlib","product":"stdlib","ecosystem":"go","affected":["stdlib >= 1.26.0-0, < 1.26.2"],"patched":["stdlib 1.26.2"],"published":"2026-04-07","updated":"2026-10-03","sourceUpdated":"2026-10-03T10:41:52.434115228Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GO-2026-4946","references":[{"url":"https://go.dev/cl/758061"},{"url":"https://go.dev/issue/78281"},{"url":"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32281.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-32281"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456333"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-32281"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32281"},{"url":"https://pkg.go.dev/vuln/GO-2026-4946"},{"url":"https://access.redhat.com/errata/RHSA-2026:42079"},{"url":"https://access.redhat.com/errata/RHSA-2026:41019"},{"url":"https://access.redhat.com/errata/RHSA-2026:16101"},{"url":"https://access.redhat.com/errata/RHSA-2026:42078"},{"url":"https://access.redhat.com/errata/RHSA-2026:54757"},{"url":"https://access.redhat.com/errata/RHSA-2026:27076"},{"url":"https://access.redhat.com/errata/RHSA-2026:28010"},{"url":"https://access.redhat.com/errata/RHSA-2026:36796"},{"url":"https://access.redhat.com/errata/RHSA-2026:39810"},{"url":"https://access.redhat.com/errata/RHSA-2026:34365"},{"url":"https://access.redhat.com/errata/RHSA-2026:20569"},{"url":"https://access.redhat.com/errata/RHSA-2026:23103"},{"url":"https://access.redhat.com/errata/RHSA-2026:67149"},{"url":"https://access.redhat.com/errata/RHSA-2026:16024"},{"url":"https://access.redhat.com/errata/RHSA-2026:18032"},{"url":"https://access.redhat.com/errata/RHSA-2026:18027"},{"url":"https://access.redhat.com/errata/RHSA-2026:19719"},{"url":"https://access.redhat.com/errata/RHSA-2026:27711"},{"url":"https://access.redhat.com/errata/RHSA-2026:20570"},{"url":"https://access.redhat.com/errata/RHSA-2026:22713"},{"url":"https://access.redhat.com/errata/RHSA-2026:20571"},{"url":"https://access.redhat.com/errata/RHSA-2026:19450"}],"tags":["osv","go","csaf","vex","red-hat"],"epss":0.00355,"epssPercentile":0.29046,"cvssSource":"vendor","cwe":["CWE-1050"],"ingestedAt":"2026-07-09T18:56:37.030Z","slug":"CVE-2026-32281","body":"## Overview\n\nValidating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service.\n\nThis only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.\n\n## Affected packages\n\n- `stdlib >= 1.26.0-0, < 1.26.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `stdlib 1.26.2`\n\n## Vendor advisories\n\n- **RHSA-2026:42079** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 for RHEL 10, Red Hat Ansible Automation Platform 2.6 for RHEL 9 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:42079)\n- **RHSA-2026:41019** · Red Hat · fixed in: RHEM 1.1 for RHEL 10, RHEM 1.1 for RHEL 9 · released 2026-07-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:41019)\n- **RHSA-2026:16101** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:16101)\n- **RHSA-2026:42078** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:42078)\n- **RHSA-2026:54757** · Red Hat · fixed in: Red Hat OpenStack Platform 16.2 · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54757)\n- **RHSA-2026:27076** · Red Hat · fixed in: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9 · released 2026-06-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:27076)\n- **RHSA-2026:28010** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:28010)\n- **RHSA-2026:36796** · Red Hat · fixed in: RHEM 1.0 for RHEL 9 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36796)\n- **RHSA-2026:39810** · Red Hat · fixed in: Red Hat OpenStack Services on OpenShift 18.0, 9Base-RHOSO-TOOLS-18 · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:39810)\n- **RHSA-2026:34365** · Red Hat · fixed in: Red Hat Satellite 6.19 for RHEL 9 · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:34365)\n- **RHSA-2026:20569** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-05-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:20569)\n- **Red Hat VEX** · Moderate · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, cert-manager Operator for Red Hat OpenShift, Confidential Compute Attestation, Deployment Validation Operator, External Secrets Operator for Red Hat OpenShift, ExternalDNS Operator, … · no fix planned: Confidential Compute Attestation, External Secrets Operator for Red Hat OpenShift, Gatekeeper 3, Migration Toolkit for Applications 8, … · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32281.json)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":5083,"id":"CVE-2026-32281","ts":1788887248005,"field":"cvss","old":null,"new":"5.9"},{"seq":5082,"id":"CVE-2026-32281","ts":1788887248005,"field":"severity","old":"none","new":"medium"},{"seq":3966,"id":"CVE-2026-32281","ts":1788886363646,"field":"cvss","old":"5.9","new":null},{"seq":3965,"id":"CVE-2026-32281","ts":1788886363646,"field":"severity","old":"medium","new":"none"},{"seq":3153,"id":"CVE-2026-32281","ts":1788883133082,"field":"cvss","old":null,"new":"5.9"},{"seq":3152,"id":"CVE-2026-32281","ts":1788883133082,"field":"severity","old":"none","new":"medium"}]}