Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 45 fixed, 25 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-862.
Summary
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 a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Go standard library | golang.org/x/crypto/ssh | before 0.52.0 | 0.52.0 | Patch available | CNA |
| — | golang.org/x/crypto (Go) | before 0.52.0 | 0.52.0 | Patch available | GHSA-89gr-r52h-f8rx |
- golang.org/x/crypto/ssh VendorGo standard library Affected before 0.52.0 Fixed in 0.52.0 Patch available CNA
- golang.org/x/crypto (Go) Vendor— Affected before 0.52.0 Fixed in 0.52.0 Patch available GHSA-89gr-r52h-f8rx
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:* | before 0.52.0 | Vulnerable | Go standard library |
- cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:* Versions before 0.52.0 Vulnerable ·Go standard library
Remediation
- Fix · CNA golang.org/x/crypto/ssh (golang.org/x/crypto) Fixed in 0.52.0
- Fix · GHSA-89gr-r52h-f8rx golang.org/x/crypto (Go) Fixed in 0.52.0 Advisory →
Red Hat 57 advisories
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Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
golang.org/x/crypto/ssh 0.52.0
9 records Highest priority Priority MEDIUM 4 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2026-34255 Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/sshPriority MEDIUM 50
- TI-2026-28716 Invoking infinite loop on large channel writes in golang.org/x/crypto/sshPriority MEDIUM 46
- TI-2026-28712 Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/sshPriority MEDIUM 46
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Assisted Installer for Red Hat OpenShift Container Platform 2 | Affected | No fix yet |
| Builds for Red Hat OpenShift | Affected | No fix yet |
| Confidential Compute Attestation | Affected | No fix planned: Will not fix |
| External Secrets Operator for Red Hat OpenShift | Affected | No fix planned: Will not fix |
| Multicluster Engine for Kubernetes | Affected | No fix yet |
| OpenShift Pipelines | Affected | No fix yet |
| OpenShift Serverless | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat Advanced Cluster Security 4 | Affected | No fix yet |
| Red Hat Ceph Storage 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat OpenShift Dev Workspaces Operator | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix yet |
| Red Hat OpenShift Virtualization 4 | Affected | No fix yet |
| Red Hat OpenShift for Windows Containers | Affected | No fix yet |
| Red Hat OpenShift on AWS | Affected | No fix yet |
| Red Hat Quay 3 | Affected | No fix yet |
| Red Hat Trusted Artifact Signer | Affected | No fix yet |
| Zero Trust Workload Identity Manager | Affected | No fix yet |
| Zero Trust Workload Identity Manager - Tech Preview | Affected | No fix planned: Will not fix |
| Cert Manager support for Red Hat OpenShift release 1.17 | Fixed | RHSA-2026:82304, RHSA-2026:82322 |
| Cluster Observability Operator 1.5 | Fixed | RHSA-2026:61314 |
| Logging Subsystem for Red Hat OpenShift 6.5 | Fixed | RHSA-2026:70870 |
| Logging Subsystem for Red Hat OpenShift 6.6 | Fixed | RHSA-2026:66521 |
| OpenShift API for Data Protection 1.3 | Fixed | RHSA-2026:51033 |
| OpenShift API for Data Protection 1.4 | Fixed | RHSA-2026:59467 |
| OpenShift API for Data Protection 1.5 | Fixed | RHSA-2026:66022 |
| OpenShift API for Data Protection 1.6 | Fixed | RHSA-2026:43692 |
| OpenShift Security Profiles Operator 1 | Fixed | RHSA-2026:76752 |
| RHEM 1.1 for RHEL 10 | Fixed | RHSA-2026:68334 |
| RHEM 1.1 for RHEL 9 | Fixed | RHSA-2026:68334 |
| Red Hat Advanced Cluster Management for Kubernetes 2.16 | Fixed | RHSA-2026:54400 |
| Red Hat Advanced Cluster Security 4.9 | Fixed | RHSA-2026:36319 |
| Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 | Fixed | RHSA-2026:36625 |
| Red Hat Edge Manager 1.1 | Fixed | RHSA-2026:68044, RHSA-2026:68253 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:67450 |
| Red Hat OpenShift AI 3.3 | Fixed | RHSA-2026:73987 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:60520 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:90274 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:82785 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:82813 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:73853 |
| Red Hat OpenShift Container Platform 4.17 | Fixed | RHSA-2026:77552 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:79039 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:74434 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:68541, RHSA-2026:71450 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:57801, RHSA-2026:66352, RHSA-2026:71453 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:54770 |
| Red Hat OpenShift Dev Spaces 3.30 | Fixed | RHSA-2026:62260 |
| Red Hat OpenShift GitOps 1.19 | Fixed | RHSA-2026:52857 |
| Red Hat OpenShift GitOps 1.20 | Fixed | RHSA-2026:52910 |
| Red Hat Openshift Data Foundation 4.22 | Fixed | RHSA-2026:37387 |
| Red Hat Quay 3.10 | Fixed | RHSA-2026:41031 |
| Red Hat Quay 3.14 | Fixed | RHSA-2026:70267 |
| Red Hat Quay 3.15 | Fixed | RHSA-2026:42796 |
| Red Hat Quay 3.16 | Fixed | RHSA-2026:41066 |
| Red Hat Quay 3.17 | Fixed | RHSA-2026:54395 |
| Red Hat Quay 3.9 | Fixed | RHSA-2026:40262 |
| Red Hat Trusted Artifact Signer 1.3 | Fixed | RHSA-2026:40969, RHSA-2026:40972, RHSA-2026:40974 |
| Red Hat Trusted Artifact Signer 1.4 | Fixed | RHSA-2026:50869, RHSA-2026:50871, RHSA-2026:50873, RHSA-2026:50910, RHSA-2026:50911, RHSA-2026:51079 |
| multicluster engine for Kubernetes 2.10 | Fixed | RHSA-2026:54432 |
| multicluster engine for Kubernetes 2.11 | Fixed | RHSA-2026:57194, RHSA-2026:72848 |
| multicluster engine for Kubernetes 2.6 | Fixed | RHSA-2026:59579 |
| multicluster engine for Kubernetes 2.8 | Fixed | RHSA-2026:59558 |
| multicluster engine for Kubernetes 2.9 | Fixed | RHSA-2026:59559 |
Not affected: 58 products
- Cluster Observability Operator 1.5
- Cryostat 4
- ExternalDNS Operator
- Logging Subsystem for Red Hat OpenShift 6.5
- Logging Subsystem for Red Hat OpenShift 6.6
- OpenShift API for Data Protection 1.3
- OpenShift API for Data Protection 1.4
- OpenShift API for Data Protection 1.5
- OpenShift API for Data Protection 1.6
- OpenShift Security Profiles Operator 1
- RHEM 1.1 for RHEL 10
- RHEM 1.1 for RHEL 9
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Advanced Cluster Management for Kubernetes 2.16
- Red Hat Advanced Cluster Security 4.9
- Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10
- Red Hat Edge Manager 1.1
- Red Hat Enterprise Linux 10
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 3.3
- Red Hat OpenShift AI 3.4
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 4.12
- Red Hat OpenShift Container Platform 4.14
- Red Hat OpenShift Container Platform 4.15
- Red Hat OpenShift Container Platform 4.16
- Red Hat OpenShift Container Platform 4.17
- Red Hat OpenShift Container Platform 4.18
- Red Hat OpenShift Container Platform 4.19
- Red Hat OpenShift Container Platform 4.20
- Red Hat OpenShift Container Platform 4.21
- Red Hat OpenShift Container Platform 4.22
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift Dev Spaces 3.30
- Red Hat OpenShift GitOps
- Red Hat OpenShift GitOps 1.19
- Red Hat OpenShift GitOps 1.20
- Red Hat OpenShift Virtualization 4
- Red Hat OpenShift for Windows Containers
- Red Hat OpenStack Platform 16.2
- Red Hat OpenStack Platform 17.1
- Red Hat OpenStack Platform 18.0
- Red Hat Openshift Data Foundation 4
- Red Hat Openshift Data Foundation 4.22
- Red Hat Quay 3.10
- Red Hat Quay 3.14
- Red Hat Quay 3.15
- Red Hat Quay 3.16
- Red Hat Quay 3.17
- Red Hat Quay 3.9
- Red Hat Trusted Artifact Signer
- Red Hat Trusted Artifact Signer 1.3
- Red Hat Trusted Artifact Signer 1.4
- multicluster engine for Kubernetes 2.10
- multicluster engine for Kubernetes 2.11
- multicluster engine for Kubernetes 2.6
- multicluster engine for Kubernetes 2.8
- multicluster engine for Kubernetes 2.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-39831
- 2026-10-03 Alias added: GHSA-89gr-r52h-f8rx
- 2026-10-07 Fix available: RHSA-2026:73987 · Red Hat
- 2026-10-07 Fix available: RHSA-2026:76752 · Red Hat
- 2026-10-07 Fix available: RHSA-2026:74434 · Red Hat
- 2026-10-07 Fix available: OpenShift Security Profiles Operator 1, Red Hat OpenShift Container Platform 4.19 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:73853 · Red Hat
- 2026-10-09 Fix available: Red Hat OpenShift Container Platform 4.16 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
- 2026-10-15 Fix available: Cert Manager support for Red Hat OpenShift release 1.17 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:77552 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:79039 · Red Hat
- 2026-10-16 Fix available: Red Hat OpenShift Container Platform 4.17, Red Hat OpenShift Container Platform 4.18 · Red Hat
- 2026-10-23 Fix available: RHSA-2026:82813 · Red Hat
- 2026-10-23 Fix available: RHSA-2026:82785 · Red Hat
- 2026-10-23 Fix available: Red Hat OpenShift Container Platform 4.14, Red Hat OpenShift Container Platform 4.15 · Red Hat
- 2026-10-29 Fix available: Red Hat OpenShift Container Platform 4.12 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:90274 · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-11-05 Fix available: Cluster Observability Operator 1.5, Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 · Red Hat
- 2026-11-08 Affected versions changed · Red Hat
References
More Go standard library Crypto vulnerabilities
- TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
- TI-2026-30791 Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts CVSS 3.1CRITICAL 9.1
- TI-2026-34255 Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh CVSS 3.1CRITICAL 10.0
- TI-2026-28715 Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent CVSS 3.1CRITICAL 9.1
- TI-2026-28714 Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent CVSS 3.1CRITICAL 9.1
- TI-2026-28716 Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh CVSS 3.1CRITICAL 9.1
Sources
- CVE-2026-39831 · CVE Program
- CVE-2026-39831 · NVD
- FIRST EPSS
- GHSA-89gr-r52h-f8rx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-39831 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences