CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HCVE-2026-39834
Critical (9.1) in golang crypto. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in golang.org/x/crypto 0.52.0.
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.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-31)
- CWE
- CWE-190
- Published
- Modified
- Record from
- the NVD, synced
Affected
- golang:crypto
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-rm3j-f69w-wqmq | Go | golang.org/x/crypto | <0.52.0 | 0.52.0 |
| GO-2026-5020 | Go | golang.org/x/crypto | <0.52.0 | 0.52.0 |