Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-39831 · CVE overview and exploitation status

EUVD-2026-31395

GHSA-89gr-r52h-f8rx

GO-2026-5019

cve-program · CVE-2026-39831

• https://go.dev/issue/79566
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://go.dev/cl/781662
• https://pkg.go.dev/vuln/GO-2026-5019

euvd · EUVD-2026-31395

• https://go.dev/issue/79566
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://go.dev/cl/781662
• https://pkg.go.dev/vuln/GO-2026-5019

nvd · CVE-2026-39831

• https://go.dev/cl/781662
• https://go.dev/issue/79566
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://pkg.go.dev/vuln/GO-2026-5019

osv · GHSA-89gr-r52h-f8rx

• https://nvd.nist.gov/vuln/detail/CVE-2026-39831
• https://cs.opensource.google/go/x/crypto
• https://go.dev/cl/781662
• https://go.dev/issue/79566
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://pkg.go.dev/vuln/GO-2026-5019

osv · GO-2026-5019

• https://go.dev/issue/79566
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://go.dev/cl/781662

• The Verify() method for FIDO/U2F security key types ([email protected], [email protected]) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of… · Advisory content revised · 1 Nov 2026