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CVE-2026-39830

Golang Crypto buffer overflow

9.1 CRITICALEPSS 0.62%
  1. Published22 May 2026

Description

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

CVSS 3.1 breakdown

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

Affected products

Golang Crypto< 0.52.0

Remediation

Fixed in
Golang Crypto≥ 0.52.0
Patch & vendor advisories

References

and 50 more references

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Frequently asked

Is CVE-2026-39830 being actively exploited?

CVE-2026-39830 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.62%.

How severe is CVE-2026-39830?

CVE-2026-39830 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2026-39830?

Affected products include Golang Crypto.

How do I fix CVE-2026-39830?

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-2026-39830 against the real software inventory on every managed device, as each hourly inventory arrives. 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.