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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
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[{"vendor":"Go standard library","product":"crypto/x509","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"crypto/x509","programRoutines":[{"name":"Certificate.buildChains"},{"name":"Certificate.Verify"}],"versions":[{"version":"0","lessThan":"1.25.9","versionType":"semver","status":"affected"},{"version":"1.26.0-0","lessThan":"1.26.2","versionType":"semver","status":"affected"}]}]
Initial Analysis by NIST4/16/2026 3:16:42 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.9
*cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.2
Added
Reference Type
Go Project: https://go.dev/cl/758320 Types: Patch
Added
Reference Type
Go Project: https://go.dev/issue/78282 Types: Issue Tracking
Added
Reference Type
Go Project: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU Types: Mailing List, Release Notes
Added
Reference Type
Go Project: https://pkg.go.dev/vuln/GO-2026-4947 Types: Vendor Advisory
CVE Modified by CISA-ADP4/08/2026 3:25:20 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added
CWE
CWE-770
New CVE Received from Go Project4/07/2026 10:16:03 PM
Action
Type
Old Value
New Value
Added
Description
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
