CVE-2026-60000Network attack vector

Pre-authentication service interruption via uncounted GSSAPI failures

Published Jul 8, 2026 · Updated Jul 8, 2026

Resource exhaustion in sshd in OpenSSH before 10.4 allows remote attackers to interrupt SSH service before authentication. The GSSAPI state marks certain failed negotiations as server-caused, so userauth_finish does not increment the failure count checked by MaxAuthTries. Exposure requires non-default GSSAPIAuthentication; PerSourcePenalties constrains abusive sources, but MaxAuthTries alone does not.

CVSS severity3.7
Low
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in sshd in OpenSSH before 10.4 allows remote attackers to interrupt SSH service before authentication. The GSSAPI state marks certain failed negotiations as server-caused, so userauth_finish does not increment the failure count checked by MaxAuthTries. Exposure requires non-default GSSAPIAuthentication; PerSourcePenalties constrains abusive sources, but MaxAuthTries alone does not.

The record

CVE
CVE-2026-60000
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
OpenBSD Project
Product
OpenSSH
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <10.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBSD Project · OpenSSHversion=0 <10.4

Published CVSS scores

3.7MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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