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CVE-2026-39834

Golang Crypto integer overflow

9.1 CRITICALEPSS 0.64%
  1. Published22 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Golang Crypto< 0.52.0

Remediation

Fixed in
Golang Crypto≥ 0.52.0
Patch & vendor advisories

References

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Frequently asked

Is CVE-2026-39834 being actively exploited?

CVE-2026-39834 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-39834?

CVE-2026-39834 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-39834?

Affected products include Golang Crypto.

How do I fix CVE-2026-39834?

Upgrade affected software to a fixed version, for example Golang Crypto 0.52.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39834 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.