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CVE-2026-89315 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

`JwtClaims.MarshalJSON` built a Go struct at runtime with `reflect.StructOf`, synthesising a field named `"A" + claimName` for each untyped claim. `reflect.StructOf` **panics** when a field name is not a valid Go identifier, or when it duplicates another field. Both conditions are reachable from ordinary JWT claim names.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/eclipse-keypont/gose/security/advisories/GHSA-hwm6-rwv6-xgq8	[email protected]	AdvisoryExploitRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-248	Uncaught Exception	[email protected]

Affected Products

Product	Versions
Eclipse KeyPont gose	< 1.0.0-rc4 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 1.0.0-rc4moderate effort Workaround:low effort Avoid calling json.Marshal on a *jose.JwtClaims obtained from Verify. Reading the claim fields directly is safe; only the marshalling path panics. Callers that must serialize claims can copy UntypedClaims into their own map first.
ThalesGroup gose	>= 0.7.3, <= 0.13.0-rc1 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 1.0.0-rc4moderate effort Consumers still on github.com/ThalesGroup/gose must change the module path, not just the version: that path ends at v0.13.0-rc1, still vulnerable, and carries a // Deprecated: directive from v0.12.2 onwards. go get -u will not remediate. Workaround:low effort Avoid calling json.Marshal on a *jose.JwtClaims obtained from Verify. Reading the claim fields directly is safe; only the marshalling path panics. Callers that must serialize claims can copy UntypedClaims into their own map first.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 2, 2026	CVE Modified	CISA-ADP
Oct 23, 2026	New CVE Received	[email protected]