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CVE-2026-39834 is an integer-overflow vulnerability in the SSH channel write handling of golang.org/x/crypto/ssh. A single Write call containing more than 4 GB of data causes truncation during an internal payload-size calculation. The resulting incorrect size comparison prevents forward progress: the write loop continuously emits empty SSH packets and spins indefinitely. golang.org/x/crypto version 0.52.0 corrects the comparison by using int64.
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No public exploit code observed for this vulnerability.
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A vulnerability addressed by the openSUSE glab package update; no technical details are provided.
One of multiple vulnerabilities in golang.org/x/crypto/ssh.
A vulnerability in Go's x/crypto/ssh package that can cause an infinite loop during large channel writes.
An integer overflow vulnerability in SSH channel write handling that can cause an infinite write loop when writing more than 4GB in a single Write call, resulting in empty packets being sent without progress.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.