CVE-2026-89315

`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.

Score

CVSS 4.0 6.9 Medium

Status

Deferred - emo@eclipse.org

Published

2026-10-23

Last modified

2026-10-23

Weaknesses

CWE-248

Affected products

• Eclipse Keypont - Gose (Eclipse Foundation)

References

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