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CVE-2025-68121

Unexpected session resumption in crypto/tls

Published: Feb 5, 2026Updated: Apr 29, 2026 Sources: CVE List NVD BDUCWE-295
NVD MITRE
10.0CVSSCRITICAL
EPSS Score
0.8%
Top 49.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-295

Affected Products

crypto/tlsGo standard library
Library
OSS Libraries / go
gogolangOSS Libraries
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Platform V SberLinux OS ServerАО «СберТех»
On-premOS
Operating Systems / linux-distro
GoThe Go ProjectOSS Libraries
go standard libraryoss-projectUSOSS Librariesaka golang standard library, net/http, crypto/x509, html/template
golangoss-projectUSOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
ао «сбертех»commercialRUOperating Systemsaka ao sbertech, сбертех
the go projectoss-projectOSS Librariesaka go, golang-google-protobuf, crypto
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://groups.google.com/g/golang-announce/c/K09ubi9FQFk
groups.google.com
https://go.dev/cl/737700
go.dev
https://go.dev/issue/77217
go.dev
and 7 more references View all →

Timeline

Published
Feb 5, 2026
Last Updated
Apr 29, 2026

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