CVE-2025-68121
Unexpected session resumption in crypto/tls
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.
How to fix CVE-2025-68121
To remediate CVE-2025-68121, upgrade the affected package to a fixed version below.
- —upgrade to 1.24.13 or later
- —no fix listed
- —no fix listed
- —no fix listed
- —upgrade to 1.25.6-1 or later
- —upgrade to 1.24.13 or later
Is CVE-2025-68121 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 1.24.13, >= 1.25.0-0, < 1.25.7
- from 0
- from 0
- from 0
- from 0, < 1.25.6-1
- from 0, < 1.24.13, >= 1.25.0-0, < 1.25.7, >= 1.26.0-rc.1, < 1.26.0-rc.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |