{"schema_version":1,"title":"github.com/refraction-networking/utls (Go) vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 3 vulnerabilities in github.com/refraction-networking/utls (Go): 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-27017, was published on 24 February 2026.","url":"https://junglewise.ai/threats/technologies/github-com-refraction-networking-utls","json_url":"https://junglewise.ai/threats/technologies/github-com-refraction-networking-utls.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/github-com-refraction-networking-utls","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":0,"all_time":3,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":0,"last_365_days":2},"latest":[{"cve":"CVE-2026-27017","cvss":4,"epss":0.0019,"slug":"cve-2026-27017-utls-has-a-fingerprint-vulnerability-from-grease-ech-mismatch-for","title":"GO-2026-4509 - Fingerprint vulnerability in uTLS from GREASE ECH mismatch for Chrome parrots in github.com/refraction-networking/utls","severity":"medium","exploited":false,"published_at":"2026-02-24T23:10:26+00:00","url":"https://junglewise.ai/threats/cve-2026-27017-utls-has-a-fingerprint-vulnerability-from-grease-ech-mismatch-for"},{"cve":"CVE-2026-26995","cvss":4,"slug":"cve-2026-26995-utls-has-a-fingerprint-vulnerability-from-missing-padding","title":"GO-2026-4512 - Fingerprint vulnerability in uTLS from missing padding extension for Chrome 120 in github.com/refraction-networking/utls","severity":"medium","exploited":false,"published_at":"2026-02-24T23:10:26+00:00","url":"https://junglewise.ai/threats/cve-2026-26995-utls-has-a-fingerprint-vulnerability-from-missing-padding"},{"cve":"CVE-2026-26994","cvss":3.1,"epss":0.0038,"slug":"cve-2026-26994-utls-serverhellos-are-accepted-without-checking-tls-1-3-downgrade","title":"GO-2025-3638 - ServerHellos are accepted without checking TLS 1.3 downgrade canaries in github.com/refraction-networking/utls","severity":"low","exploited":false,"published_at":"2025-04-24T18:13:59+00:00","url":"https://junglewise.ai/threats/cve-2026-26994-utls-serverhellos-are-accepted-without-checking-tls-1-3-downgrade"}],"weekly":[{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"github.com/mattermost/mattermost-server (Go)","slug":"github-com-mattermost-mattermost-server","vulnerabilities":274,"url":"https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server"},{"name":"github.com/mattermost/mattermost-server/v6 (Go)","slug":"github-com-mattermost-mattermost-server-v6","vulnerabilities":188,"url":"https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v6"},{"name":"github.com/mattermost/mattermost-server/v5 (Go)","slug":"github-com-mattermost-mattermost-server-v5","vulnerabilities":186,"url":"https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v5"},{"name":"github.com/mattermost/mattermost/server/v8 (Go)","slug":"github-com-mattermost-mattermost-server-v8","vulnerabilities":182,"url":"https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v8"},{"name":"stdlib (Go)","slug":"go-stdlib","vulnerabilities":161,"url":"https://junglewise.ai/threats/technologies/go-stdlib"},{"name":"github.com/siyuan-note/siyuan/kernel (Go)","slug":"github-com-siyuan-note-siyuan-kernel","vulnerabilities":158,"url":"https://junglewise.ai/threats/technologies/github-com-siyuan-note-siyuan-kernel"},{"name":"code.gitea.io/gitea (Go)","slug":"code-gitea-io-gitea","vulnerabilities":128,"url":"https://junglewise.ai/threats/technologies/code-gitea-io-gitea"},{"name":"gogs.io/gogs (Go)","slug":"gogs-io-gogs","vulnerabilities":82,"url":"https://junglewise.ai/threats/technologies/gogs-io-gogs"},{"name":"github.com/traefik/traefik (Go)","slug":"github-com-traefik-traefik","vulnerabilities":75,"url":"https://junglewise.ai/threats/technologies/github-com-traefik-traefik"},{"name":"github.com/usememos/memos (Go)","slug":"github-com-usememos-memos","vulnerabilities":75,"url":"https://junglewise.ai/threats/technologies/github-com-usememos-memos"},{"name":"github.com/traefik/traefik/v2 (Go)","slug":"github-com-traefik-traefik-v2","vulnerabilities":73,"url":"https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v2"},{"name":"github.com/traefik/traefik/v3 (Go)","slug":"github-com-traefik-traefik-v3","vulnerabilities":68,"url":"https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v3"}],"technology":{"hub":true,"name":"github.com/refraction-networking/utls (Go)","slug":"github-com-refraction-networking-utls","vendor":{"name":"Go","slug":"go","url":"https://junglewise.ai/threats/vendors/go"},"aliases":[],"url":"https://junglewise.ai/threats/technologies/github-com-refraction-networking-utls"},"most_severe":[{"cve":"CVE-2026-27017","cvss":4,"epss":0.0019,"slug":"cve-2026-27017-utls-has-a-fingerprint-vulnerability-from-grease-ech-mismatch-for","title":"GO-2026-4509 - Fingerprint vulnerability in uTLS from GREASE ECH mismatch for Chrome parrots in github.com/refraction-networking/utls","severity":"medium","exploited":false,"published_at":"2026-02-24T23:10:26+00:00","url":"https://junglewise.ai/threats/cve-2026-27017-utls-has-a-fingerprint-vulnerability-from-grease-ech-mismatch-for"},{"cve":"CVE-2026-26995","cvss":4,"slug":"cve-2026-26995-utls-has-a-fingerprint-vulnerability-from-missing-padding","title":"GO-2026-4512 - Fingerprint vulnerability in uTLS from missing padding extension for Chrome 120 in github.com/refraction-networking/utls","severity":"medium","exploited":false,"published_at":"2026-02-24T23:10:26+00:00","url":"https://junglewise.ai/threats/cve-2026-26995-utls-has-a-fingerprint-vulnerability-from-missing-padding"},{"cve":"CVE-2026-26994","cvss":3.1,"epss":0.0038,"slug":"cve-2026-26994-utls-serverhellos-are-accepted-without-checking-tls-1-3-downgrade","title":"GO-2025-3638 - ServerHellos are accepted without checking TLS 1.3 downgrade canaries in github.com/refraction-networking/utls","severity":"low","exploited":false,"published_at":"2025-04-24T18:13:59+00:00","url":"https://junglewise.ai/threats/cve-2026-26994-utls-serverhellos-are-accepted-without-checking-tls-1-3-downgrade"}],"generated_at":"2026-09-28T03:07:00.154823+00:00"}