Unexpected session resumption in crypto/tls

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Summary

CVECVE-2025-68121
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-05 18:16:10 UTC
Updated2026-04-29 14:16:16 UTC
DescriptionDuring 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.

Risk And Classification

Primary CVSS: v3.1 10 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-295 | CWE-295: Improper Certificate Validation | CWE-295 CWE-295 Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Crypto/tls affected 1.24.13 semver Not specified
CNA Go Standard Library Crypto/tls affected 1.25.0-0 1.25.7 semver Not specified
CNA Go Standard Library Crypto/tls affected 1.26.0-rc.1 1.26.0-rc.3 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-4337 [email protected] pkg.go.dev Vendor Advisory
groups.google.com/g/golang-announce/c/K09ubi9FQFk [email protected] groups.google.com Mailing List, Third Party Advisory
go.dev/issue/77217 [email protected] go.dev Exploit, Issue Tracking
go.dev/cl/737700 [email protected] go.dev Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Coia Prant (github.com/rbqvq) (en)

CNA: Go Security Team (en)

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