CVE-2025-68121None▾ SunlitUnexpected session resumption in crypto/tls
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.8%
Last analysed / modified upstream
0.8% → 0.9%
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.
stdlib >= 1.26.0-rc.1, < 1.26.0-rc.3Upgrade to a patched release:
stdlib 1.26.0-rc.3Connected by shared product, vendor, weakness, or advisory.
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