CVE-2026-46595 — Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh

Affected: golang.org/x/crypto/ssh, Red Hat Cryostat 4 on RHEL 9, Red Hat RHEM 1.0 for RHEL 9, Red Hat RHEM 1.1 for RHEL 10, Red Hat RHEM 1.1 for RHEL 9, Red Hat Cert Manager support for Red Hat OpenShift release 1.19, Red Hat Cluster Observability Operator 1.5.0, Red Hat DevWorkspace Operator 0.42, Red Hat Logging Subsystem for Red Hat OpenShift 6.6, Red Hat multicluster engine for Kubernetes 2.8 and 46 more

Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped.

USN-8447-1 — golang-go.crypto vulnerabilities

Affected: Ubuntu:Pro:16.04:LTS: golang-go.crypto, Ubuntu:Pro:18.04:LTS: golang-go.crypto, Ubuntu:Pro:20.04:LTS: golang-go.crypto, Ubuntu:Pro:22.04:LTS: golang-go.crypto, Ubuntu:Pro:24.04:LTS: golang-go.crypto, Ubuntu:Pro:26.04:LTS: golang-go.crypto

It was discovered that Go Cryptography did not properly handle SSH global request responses. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39830)

It was discovered that Go Cryptography did not properly verify user presence when using FIDO/U2F security keys. An attacker could possibly use this issue to bypass user presence verification for hardware security keys. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39831)

It was discovered that Go Cryptography did not properly serialize SSH agent key constraint extensions. An attacker could possibly use this issue to bypass intended key usage restrictions. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39832)

It was discovered that Go Cryptography did not properly enforce the confirm-before-use constraint in the SSH agent keyring. An attacker could possibly use this issue to use SSH keys without the required user confirmation. (CVE-2026-39833)

It was discovered that Go Cryptography had an integer overflow when handling large SSH channel writes. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39834)

It was discovered that Go Cryptography did not properly check certificate authority key revocation. An attacker could possibly use this issue to bypass certificate authority revocation checks. This issue only affected Ubuntu 1…

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CVE-2026-46595 — Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh

USN-8447-1 — golang-go.crypto vulnerabilities