sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay
OpenBSD · OpenSSH
6.5MediumCVSS 3.1
Recommended action
Scheduled
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available
Distribution package intelligence
Ubuntu vendor package status
Canonical’s release and source-package findings are shown separately from local repository availability.
2 package states
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
Ubuntu release
Source package
Vendor state
Fixed version
Evidence
Ubuntu 24.04 LTSnoble · standard archive
openssh
Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
1 current
CVE-2026-60001 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityopenssh: OpenSSH: Brute-force attacks facilitated due to insufficient authentication delay
42 known affected
The vendor explicitly identifies these products as affected by this CVE.
openssh as a component of Red Hat Enterprise Linux 10
openssh-askpass as a component of Red Hat Enterprise Linux 10
openssh-clients as a component of Red Hat Enterprise Linux 10
openssh-keycat as a component of Red Hat Enterprise Linux 10
openssh-keysign as a component of Red Hat Enterprise Linux 10
openssh-server as a component of Red Hat Enterprise Linux 10
openssh.src as a component of Red Hat Enterprise Linux 10
openssh as a component of Red Hat Enterprise Linux 6
openssh-askpass as a component of Red Hat Enterprise Linux 6
openssh-clients as a component of Red Hat Enterprise Linux 6
openssh-ldap as a component of Red Hat Enterprise Linux 6
openssh-server as a component of Red Hat Enterprise Linux 6
Summary
A flaw was found in OpenSSH's SSH daemon (sshd). A remote attacker could exploit this vulnerability by repeatedly attempting authentication. The flaw allows the attacker to bypass the intended minimum authentication delay, which can facilitate brute-force attacks. This makes it easier for an attacker to guess valid credentials, potentially leading to unauthorized access or a denial of service.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2026-42145
No EUVD known-exploited evidence
ENISA has published the identifier mapping but no EUVD description has been stored yet.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available
01
What, why and how
sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.
What
sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.
Why
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.
Why
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No confirmed evidence
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.None recorded
No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
Likely attack path
a network path → Allocation of Resources Without Limits or Throttling → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-770: Allocation of Resources Without Limits or Throttling. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
CVSS vector ?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-770
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-42145Official EUVD mapping
0 linked advisory records.
Official EUVD recordBSI · German · WID-SEC-2026-3038Meinberg LANTIME: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Meinberg LANTIME ausnutzen, um beliebigen Code auszuführen, Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, sensible Informationen offenzulegen, Daten zu manipulieren oder Denial-of-Service-Zustände herbeizuführen.
Official advisoryBSI · German · WID-SEC-2026-2858IBM AIX und VIOS: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in IBM AIX und IBM VIOS ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.
Official advisoryBSI · German · WID-SEC-2026-2221OpenSSH: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in OpenSSH ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.
Official advisoryCERT-FR · French · CERTFR-2026-AVI-1067Multiples vulnérabilités dans les produits IBM
Official advisoryCERT-FR · French · CERTFR-2026-AVI-0873Multiples vulnérabilités dans Microsoft Azure Linux
de sécurité Microsoft Azure Linux CVE-2026-56001 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-56002 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-56003 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-59995 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-59996 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-59997 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-59999 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-60000 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-60001 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-60002 du 09 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-14380 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-14461 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-14739 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-14740 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-20213 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-20214 du 11 juillet 2026
Bulletin de sécurité Microsoft Azure Linux CVE-2026-20215 du 11 juillet 2026
Bulletin de sé
Official advisoryNCSC-NL · Dutch · NCSC-2026-0321Meerdere kwetsbaarheden verholpen in IBM AIX en IBM PowerVM VIOS
OpenSSH versions prior to 10.4 contain multiple vulnerabilities including inconsistent enforcement of minimum authentication delay, improper file location constraints, argument handling flaws, and a use-after-free during host key re-exchange, enabling unauthorized access, brute-force attacks, and potential code execution.
Operational remediation based on structured source evidence.
Status ?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
openssh as a component of Red Hat Enterprise Linux 10; openssh-askpass as a component of Red Hat Enterprise Linux 10; openssh-clients as a component of Red Hat Enterprise Linux 10; openssh-keycat as a component of Red Hat Enterprise Linux 10; openssh-keysign as a component of Red Hat Enterprise Linux 10; openssh-server as a component of Red Hat Enterprise Linux 10; openssh.src as a component of Red Hat Enterprise Linux 10; openssh as a component of Red Hat Enterprise Linux 6; openssh-askpass as a component of Red Hat Enterprise Linux 6; openssh-clients as a component of Red Hat Enterprise Linux 6; openssh-ldap as a component of Red Hat Enterprise Linux 6; openssh-server as a component of Red Hat Enterprise Linux 6; openssh.src as a component of Red Hat Enterprise Linux 6; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6; openssh as a component of Red Hat Enterprise Linux 7; openssh-askpass as a component of Red Hat Enterprise Linux 7; openssh-cavs as a component of Red Hat Enterprise Linux 7; openssh-clients as a component of Red Hat Enterprise Linux 7; openssh-keycat as a component of Red Hat Enterprise Linux 7; openssh-ldap as a component of Red Hat Enterprise Linux 7; openssh-server as a component of Red Hat Enterprise Linux 7; openssh-server-sysvinit as a component of Red Hat Enterprise Linux 7; openssh.src as a component of Red Hat Enterprise Linux 7; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 7; openssh as a component of Red Hat Enterprise Linux 8; openssh-askpass as a component of Red Hat Enterprise Linux 8; openssh-cavs as a component of Red Hat Enterprise Linux 8; openssh-clients as a component of Red Hat Enterprise Linux 8; openssh-keycat as a component of Red Hat Enterprise Linux 8; openssh-ldap as a component of Red Hat Enterprise Linux 8; and 12 more
Fixed
openssh-main@aarch64 as a component of Red Hat Hardened Images; openssh-main@src as a component of Red Hat Hardened Images; openssh-main@x86_64 as a component of Red Hat Hardened Images
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 8 Jul 2026 · Last source change 8 Jul 2026, 13:03 UTC · CWE-770 · Allocation of Resources Without Limits or Throttling
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source ?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-42145
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Affected versionsThe structured affected or fixed version information changed.
Before
openssh as a component of Red Hat Enterprise Linux 10; openssh-askpass as a component of Red Hat Enterprise Linux 10; openssh-clients as a component of Red Hat Enterprise Linux 10; openssh-keycat as a component of Red Hat Enterprise Linux 10; openssh-keysign as a component of Red Hat Enterprise Linux 10; openssh-server as a component of Red Hat Enterprise Linux 10; openssh.src as a component of Red Hat Enterprise Linux 10; openssh as a component of Red Hat Enterprise Linux 6; openssh-askpass as a component of Red Hat Enterprise Linux 6; openssh-clients as a component of Red Hat Enterprise Linux 6; openssh-ldap as a component of Red Hat Enterprise Linux 6; openssh-server as a component of Red Hat Enterprise Linux 6; openssh.src as a component of Red Hat Enterprise Linux 6; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6; openssh as a component of Red Hat Enterprise Linux 7; openssh-askpass as a component of Red Hat Enterprise Linux 7; openssh-cavs as a component of Red Hat Enterprise Linux 7; openssh-clients as a component of Red Hat Enterprise Linux 7; openssh-keycat as a component of Red Hat Enterprise Linux 7; openssh-ldap as a component of Red Hat Enterprise Linux 7; openssh-server as a component of Red Hat Enterprise Linux 7; openssh-server-sysvinit as a component of Red Hat Enterprise Linux 7; openssh.src as a component of Red Hat Enterprise Linux 7; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 7; openssh as a component of Red Hat Enterprise Linux 8; openssh-askpass as a component of Red Hat Enterprise Linux 8; openssh-cavs as a component of Red Hat Enterprise Linux 8; openssh-clients as a component of Red Hat Enterprise Linux 8; openssh-keycat as a component of Red Hat Enterprise Linux 8; openssh-ldap as a component of Red Hat Enterprise Linux 8; and 11 more · Fixed: openssh-main@aarch64 as a component of Red Hat Hardened Images; openssh-main@src as a component of Red Hat Hardened Images; openssh-main@x86_64 as a component of Red Hat Hardened Images
After
openssh as a component of Red Hat Enterprise Linux 10; openssh-askpass as a component of Red Hat Enterprise Linux 10; openssh-clients as a component of Red Hat Enterprise Linux 10; openssh-keycat as a component of Red Hat Enterprise Linux 10; openssh-keysign as a component of Red Hat Enterprise Linux 10; openssh-server as a component of Red Hat Enterprise Linux 10; openssh.src as a component of Red Hat Enterprise Linux 10; openssh as a component of Red Hat Enterprise Linux 6; openssh-askpass as a component of Red Hat Enterprise Linux 6; openssh-clients as a component of Red Hat Enterprise Linux 6; openssh-ldap as a component of Red Hat Enterprise Linux 6; openssh-server as a component of Red Hat Enterprise Linux 6; openssh.src as a component of Red Hat Enterprise Linux 6; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6; openssh as a component of Red Hat Enterprise Linux 7; openssh-askpass as a component of Red Hat Enterprise Linux 7; openssh-cavs as a component of Red Hat Enterprise Linux 7; openssh-clients as a component of Red Hat Enterprise Linux 7; openssh-keycat as a component of Red Hat Enterprise Linux 7; openssh-ldap as a component of Red Hat Enterprise Linux 7; openssh-server as a component of Red Hat Enterprise Linux 7; openssh-server-sysvinit as a component of Red Hat Enterprise Linux 7; openssh.src as a component of Red Hat Enterprise Linux 7; pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 7; openssh as a component of Red Hat Enterprise Linux 8; openssh-askpass as a component of Red Hat Enterprise Linux 8; openssh-cavs as a component of Red Hat Enterprise Linux 8; openssh-clients as a component of Red Hat Enterprise Linux 8; openssh-keycat as a component of Red Hat Enterprise Linux 8; openssh-ldap as a component of Red Hat Enterprise Linux 8; and 12 more · Fixed: openssh-main@aarch64 as a component of Red Hat Hardened Images; openssh-main@src as a component of Red Hat Hardened Images; openssh-main@x86_64 as a component of Red Hat Hardened Images
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
CVE-2026-60001: sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay | BlackTree
