medium6.9
CVE-2026-89315
`JwtClaims.MarshalJSON` built a Go struct at runtime with `reflect.StructOf`, synthesising a field named `"A" + claimName` for each untyped claim.
Impact
`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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Eclipse Foundation | Eclipse KeyPont - GOSE | from 0.7.3 through 0.13.0-rc1 before 1.0.0-rc4 Version 0.7.3 ≤0.13.0-rc1 |