CVE-2026-42508 — Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts

Affected: golang.org/x/crypto/ssh/knownhosts, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Enterprise Linux 9, Red Hat RHEM 1.0 for RHEL 9, Red Hat RHEM 1.1 for RHEL 10 and 45 more

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.

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-2026-42508 — Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts

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