--- id: CVE-2026-32280 title: >- 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 summary: >- 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 u… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-770 vendor: golang product: go affected: - go < 1.25.9 - 'go >= 1.26.0, < 1.26.2' patched: - go 1.26.2 published: '2026-04-08' updated: '2026-09-18' sourceUpdated: '2026-09-18T13:17:45.920' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32280' references: - url: 'https://go.dev/cl/758320' label: security@golang.org - url: 'https://go.dev/issue/78282' label: security@golang.org - url: 'https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU' label: security@golang.org - url: 'https://pkg.go.dev/vuln/GO-2026-4947' label: security@golang.org - url: 'https://access.redhat.com/errata/RHSA-2026:10217' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:10219' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:10704' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:11507' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - 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nvd - cve.org - osv - go epss: 0.00615 epssPercentile: 0.48123 aliases: - GO-2026-4947 - BIT-golang-2026-32280 ecosystem: go ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-04-08T17:46:14.569488Z' ingestedAt: '2026-07-01T15:50:58.761Z' --- ## Overview 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. ## Affected - `go < 1.25.9` - `go >= 1.26.0, < 1.26.2` ## Remediation Upgrade past the affected range: - `go 1.26.2` ## Package advisory (CVE-2026-32280) Affected packages: - `stdlib >= 1.26.0-0, < 1.26.2` Patched in: - `stdlib 1.26.2` Source: https://osv.dev/vulnerability/GO-2026-4947