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.
History

Thu, 12 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 10 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang go
CPEs cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
cpe:2.3:a:golang:go:1.26.0:rc1:*:*:*:*:*:*
cpe:2.3:a:golang:go:1.26.0:rc2:*:*:*:*:*:*
Vendors & Products Golang
Golang go

Fri, 06 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 06 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto Tls
Vendors & Products Go Standard Library
Go Standard Library crypto Tls

Thu, 05 Feb 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Unexpected session resumption in crypto/tls
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published: 2026-02-05T17:48:44.141Z

Updated: 2026-02-06T15:35:32.823Z

Reserved: 2025-12-15T16:48:04.451Z

Link: CVE-2025-68121

cve-icon Vulnrichment

Updated: 2026-02-06T15:32:38.457Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-05T18:16:10.857

Modified: 2026-02-10T16:08:03.303

Link: CVE-2025-68121

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-05T17:48:44Z

Links: CVE-2025-68121 - Bugzilla