Validating 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. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00007.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Go standard library crypto/x509 unaffected
Version Status Constraints
0 affected < 1.25.9
1.26.0-0 affected < 1.26.2

No data.

No data.

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Vendors Products
Go Standard Library Subscribe
Crypto/x509 Subscribe

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://go.dev/cl/758061 cve-icon cve-icon cve-icon
https://go.dev/issue/78281 cve-icon cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-32281 cve-icon
https://pkg.go.dev/vuln/GO-2026-4946 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-32281 cve-icon
History

Thu, 09 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto/x509
Weaknesses CWE-770
Vendors & Products Go Standard Library
Go Standard Library crypto/x509

Thu, 09 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1050
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 08 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770

Wed, 08 Apr 2026 01:45:00 +0000

Type Values Removed Values Added
Description Validating 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. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Title Inefficient policy validation in crypto/x509
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-04-08T01:06:58.354Z

Reserved: 2026-03-11T16:38:46.556Z

Link: CVE-2026-32281

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-08T02:16:03.350

Modified: 2026-04-08T21:26:35.910

Link: CVE-2026-32281

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-08T01:06:58Z

Links: CVE-2026-32281 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-09T08:28:13Z

Weaknesses