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CVE-2025-68121

Golang Go vulnerability

10.0 CRITICALPublic exploitEPSS 0.92%
  1. Published5 Feb 2026

Description

During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake.

CVSS 3.1 breakdown

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

Affected products

Golang Go≥ 1.25.0 < 1.25.7 · < 1.24.13 · 1.26.0

Remediation

Fixed in
Golang Go≥ 1.25.7

References

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Frequently asked

Is CVE-2025-68121 being actively exploited?

CVE-2025-68121 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.92%.

How severe is CVE-2025-68121?

CVE-2025-68121 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.92% probability of exploitation.

Which products are affected by CVE-2025-68121?

Affected products include Golang Go.

How do I fix CVE-2025-68121?

Upgrade affected software to a fixed version, for example Golang Go 1.25.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-68121 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.