CVE-2026-39834

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Source
https://cve.org/CVERecord?id=CVE-2026-39834
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39834.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-39834
Aliases
Downstream
Related
Published
2026-05-22T02:31:27.540Z
Modified
2026-06-09T18:29:18.552597680Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
Summary
Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh
Details

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39834.json",
    "cna_assigner": "Go",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "fixed": "0.52.0"
                }
            ]
        }
    ]
}
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
a1c0d9929856c8aba2b31f079340f00578eda803
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.52.0"
        }
    ]
}

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
v0.6.0
v0.7.0
v0.8.0
v0.9.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39834.json"