CVE-2026-89315

JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix

State: Published
Severity: 6.9 Medium
Published: Oct 23, 2026
Updated: Oct 23, 2026
Reserved: Sep 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	eclipse

Weaknesses

CWE-248 Uncaught Exception

Affected Products

Product	Versions
Eclipse KeyPont - GOSEEclipse Foundation	0.7.3 through 0.13.0-rc1Affected
Eclipse KeyPont - GOSEEclipse Foundation	before 1.0.0-rc4Affected

References

https://github.com/eclipse-keypont/gose/security/advisories/GHSA-hwm6-rwv6-xgq8

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