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Vulnerability Details :

CVE-2026-39827

Summary
Assigner-Go
Assigner Org ID-1bb62c36-49e3-4200-9d77-64a1400537cc
Published At-22 May, 2026 | 02:31
Updated At-22 May, 2026 | 18:35
Rejected At-
Credits

Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Go
Assigner Org ID:1bb62c36-49e3-4200-9d77-64a1400537cc
Published At:22 May, 2026 | 02:31
Updated At:22 May, 2026 | 18:35
Rejected At:
▼CVE Numbering Authority (CNA)
Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

Affected Products
Vendor
golang.org/x/crypto
Product
golang.org/x/crypto/ssh
Collection URL
https://pkg.go.dev
Package Name
golang.org/x/crypto/ssh
Program Routines
  • channel.Reject
Default Status
unaffected
Versions
Affected
  • From 0 before 0.52.0 (semver)
Problem Types
TypeCWE IDDescription
N/AN/ACWE-401: Missing Release of Memory after Effective Lifetime
Type: N/A
CWE ID: N/A
Description: CWE-401: Missing Release of Memory after Effective Lifetime
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Ziyan Zhou
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://go.dev/issue/35127
N/A
https://go.dev/cl/781320
N/A
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
N/A
https://pkg.go.dev/vuln/GO-2026-5016
N/A
Hyperlink: https://go.dev/issue/35127
Resource: N/A
Hyperlink: https://go.dev/cl/781320
Resource: N/A
Hyperlink: https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Resource: N/A
Hyperlink: https://pkg.go.dev/vuln/GO-2026-5016
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@golang.org
Published At:22 May, 2026 | 04:16
Updated At:26 May, 2026 | 17:58

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CPE Matches
Go
golang
>>crypto>>Versions before 0.52.0(exclusive)
cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*
Weaknesses
CWE IDTypeSource
CWE-924Primarynvd@nist.gov
CWE ID: CWE-924
Type: Primary
Source: nvd@nist.gov
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://go.dev/cl/781320security@golang.org
Issue Tracking
https://go.dev/issue/35127security@golang.org
Issue Tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvIsecurity@golang.org
Mailing List
https://pkg.go.dev/vuln/GO-2026-5016security@golang.org
Vendor Advisory
Hyperlink: https://go.dev/cl/781320
Source: security@golang.org
Resource:
Issue Tracking
Hyperlink: https://go.dev/issue/35127
Source: security@golang.org
Resource:
Issue Tracking
Hyperlink: https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Source: security@golang.org
Resource:
Mailing List
Hyperlink: https://pkg.go.dev/vuln/GO-2026-5016
Source: security@golang.org
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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