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Go x/crypto/ssh EUVDEUVD-2026-70266

| CVE-2026-78662 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-09-02
7.5
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
7.5 HIGH

Impact is exclusively availability (connection deadlock); C:H in the provided vector is a scoring error; PR:N accepted from vendor CVSS.

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

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

Lifecycle Timeline

7
POC Analysis Generated
Sep 10, 2026 - 11:25 vuln.today
Analysis Updated
Sep 03, 2026 - 14:32 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 03, 2026 - 14:22 vuln.today
cvss_changed
CVSS changed
Sep 03, 2026 - 14:22 NVD
7.5 (HIGH)
Patch available
Sep 02, 2026 - 21:17 EUVD
Analysis Generated
Sep 02, 2026 - 20:17 vuln.today
CVE Published
Sep 02, 2026 - 19:14 oss-security
HIGH

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Connection deadlock in golang.org/x/crypto/ssh (all versions before 0.56.0) allows a malicious remote SSH peer to permanently freeze an SSH connection by flooding the incomingRequests queue of a channel that has been registered in the mux's chanList but not yet established. The attack exploits the absence of any established-state guard in the packet handler, causing a deadlock that renders the entire connection unresponsive without triggering an explicit teardown. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
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Impact
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Vulnerability AssessmentAI

Exploitation The attack is exploitable against any Go SSH server or client using golang.org/x/crypto/ssh prior to version 0.56.0 that accepts connections from untrusted peers. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 7.5 with vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N contains a significant internal inconsistency: the described impact is a connection deadlock - a pure availability failure - yet the vector assigns C:H and A:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade golang.org/x/crypto to version 0.56.0 or later, which introduces the atomic established-state guard in the SSH multiplexer. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: perform inventory of all production and development deployments using golang.org/x/crypto/ssh to quantify organizational exposure. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Micro 5.5 Affected
SUSE Linux Enterprise Module for Public Cloud 12 Affected
SUSE Linux Enterprise Server 12 Affected

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EUVD-2026-70266 vulnerability details – vuln.today

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