CVE-2026-46595
Description
A flaw was found in golang.org/x/crypto/ssh. Source-address validation can be skipped when an SSH server configuration uses an authentication callback type other than public key, allowing authorization bypass in misconfigured servers. This is a follow-on to incomplete coverage from the CVE-2024-45337 fix.
Statement
golang.org/x/crypto/ssh is vulnerable to authorization bypass when SSH server configurations rely on source-address validation alongside non-public-key authentication callbacks. An attacker with low privileges who can authenticate through such a callback path may bypass intended source-address restrictions and gain unauthorized SSH access. Red Hat impact sits in services built with affected x/crypto/ssh, including RHEL golang streams, hummingbird Go toolchains, RHACM/MCE agents, and OpenShift or Ceph components that embed Go SSH servers with mixed callback types.
Mitigation
Upgrade to a fixed golang.org/x/crypto/ssh release via updated golang or package rebuilds. Ensure SSH servers use supported public-key callback configurations with source-address validation as intended.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | N/A | 10 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Changed |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Frequently Asked Questions
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