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OpenSSH CVE-2026-60001

| EUVDEUVD-2026-42145 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-07-08 mitre GHSA-8pmr-cc7f-4v7w
6.5
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
vuln.today AI
6.5 MEDIUM

Remotely triggerable with no authentication; impact bounded to throttle bypass enabling faster brute-force (I:L) and minor resource exhaustion potential (A:L), with no confidentiality impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

Lifecycle Timeline

2
Patch available
Jul 08, 2026 - 02:01 EUVD
Analysis Generated
Jul 08, 2026 - 01:23 vuln.today

DescriptionCVE.org

sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.

AnalysisAI

OpenSSH sshd before version 10.4 fails to consistently enforce its built-in minimum authentication delay, undermining the rate-limiting defense designed to slow credential-guessing attacks against SSH services. All OpenSSH releases prior to 10.4 are affected across all platforms, enabling unauthenticated remote attackers to submit authentication attempts at a rate higher than the daemon intends to permit. No public exploit code has been identified and the vulnerability is absent from CISA KEV; however, the trivial attack complexity combined with OpenSSH's near-universal deployment footprint makes prompt patching appropriate.

Technical ContextAI

OpenSSH's sshd daemon implements a minimum authentication delay as a defense-in-depth control: after each failed or pending authentication attempt, sshd imposes a configurable pause before processing the next attempt, rate-limiting brute-force and credential-stuffing attacks at the server level. CWE-770 (Allocation of Resources Without Limits or Throttling) captures the root cause - under certain conditions the daemon does not consistently enforce this delay, allowing the resource (authentication attempt slots) to be consumed without the intended throttle. The affected software is the OpenBSD OpenSSH server identified by CPE cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*, covering all releases before 10.4. The flaw is within sshd's own rate-control enforcement logic, not in the SSH protocol itself; downstream distributions shipping any OpenSSH version prior to 10.4 inherit the exposure until they backport or upgrade.

RemediationAI

Upgrade to OpenSSH 10.4p1 or later, the vendor-released patch confirmed by release notes at https://www.openssh.org/releasenotes.html#10.4p1. As a compensating control prior to upgrade, disable password-based and keyboard-interactive authentication in sshd_config by setting PasswordAuthentication no and KbdInteractiveAuthentication no, enforcing public-key-only login; this eliminates the practical value of bypassing the authentication delay since public-key negotiation is not brute-forceable in the same manner, though it will lock out users who have not configured SSH keys. Deploying external rate-limiting via firewall rules (e.g., iptables/nftables connection-rate limits on TCP/22) or intrusion-prevention tools such as fail2ban or sshguard provides an additional layer that compensates for the missing internal delay; note these tools may block legitimate users on shared egress IPs or NAT environments. Restricting SSH access to trusted source IP allowlists at the network perimeter is the most effective and lowest-overhead compensating control for environments with predictable access patterns.

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Severity: Moderate
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CVE-2026-60001 vulnerability details – vuln.today

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