CVE-2026-56855

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Source
https://cve.org/CVERecord?id=CVE-2026-56855
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56855.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-56855
Aliases
Downstream
Related
Published
2026-09-02T19:37:05Z
Modified
2026-09-09T18:26:46Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh
Details

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

Database specific 
{
    "cna_assigner": "Go",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56855.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "0.56.0"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/golang/crypto

Affected ranges

Type
GIT
Repo
https://github.com/golang/crypto
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
86efde54dc7069251a8b007026c500d28e4239ce
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.56.0"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

v0.*
v0.1.0
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.17.0
v0.18.0
v0.19.0
v0.2.0
v0.20.0
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.3.0
v0.30.0
v0.31.0
v0.32.0
v0.33.0
v0.34.0
v0.35.0
v0.36.0
v0.37.0
v0.38.0
v0.39.0
v0.4.0
v0.40.0
v0.41.0
v0.42.0
v0.43.0
v0.44.0
v0.45.0
v0.46.0
v0.47.0
v0.48.0
v0.49.0
v0.5.0
v0.50.0
v0.51.0
v0.52.0
v0.53.0
v0.54.0
v0.55.0
v0.6.0
v0.7.0
v0.8.0
v0.9.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56855.json"