--- id: CVE-2026-42499 title: >- Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322. summary: >- Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322. 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-1046 - CWE-407 vendor: golang product: go affected: - go < 1.25.10 - 'go >= 1.26.0, < 1.26.3' patched: - go 1.26.3 published: '2026-05-07' updated: '2026-09-18' sourceUpdated: '2026-09-18T13:18:17.093' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42499' references: - url: 'https://go.dev/cl/771520' label: security@golang.org - url: 'https://go.dev/issue/78987' label: security@golang.org - url: 'https://groups.google.com/g/golang-announce/c/qcCIEXso47M' label: security@golang.org - url: 'https://pkg.go.dev/vuln/GO-2026-4977' label: security@golang.org - url: 'https://access.redhat.com/errata/RHSA-2026:17713' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - 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url: 'https://access.redhat.com/errata/RHSA-2026:68334' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68504' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68527' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-42499' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467809' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42499.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c tags: - nvd - cve.org - osv - go epss: 0.00798 epssPercentile: 0.55021 aliases: - GO-2026-4977 - BIT-golang-2026-42499 ecosystem: go ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-05-08T16:55:28.873015Z' ingestedAt: '2026-07-01T15:50:58.820Z' --- ## Overview Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322. ## Affected - `go < 1.25.10` - `go >= 1.26.0, < 1.26.3` ## Remediation Upgrade past the affected range: - `go 1.26.3` ## Package advisory (CVE-2026-42499) Affected packages: - `stdlib >= 1.26.0-0, < 1.26.3` Patched in: - `stdlib 1.26.3` Source: https://osv.dev/vulnerability/GO-2026-4977