CVE•Published 2026-05-22•Modified 2026-05-28•1 article on news•6 live references•NVD data
CVE-2026-39834Golang · Crypto
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS percentile
—
Weaknesses (CWE)
Description
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.
Timeline
Published 2026-05-22
Modified 2026-05-28
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-39834Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Golang Crypto"All exposed Golang Crypto instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Crypto"HTTP body or banner mentions "Crypto" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-39834Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-39834Censys host search filtered to this CVE id.
grep.app
CVE-2026-39834Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-39834GitHub code search for direct mentions.
Google dork
"CVE-2026-39834" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-39834 on GitHub.