CVE-2026-89315 JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix
Medium 6.9
Published
Updated
Check this codebase for CVE-2026-89315 and fix it if it is affected.
What it is: CVE-2026-89315 is a medium-severity vulnerability in Eclipse KeyPont - GOSE, published on 23 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-89315 in the wild and no public exploit code.
Affected product: Eclipse KeyPont - GOSE. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-89315/ (Markdown: https://insights.sbomify.com/CVE-2026-89315/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-89315?
CVE-2026-89315 is a medium-severity vulnerability in Eclipse KeyPont - GOSE, published on 23 Oct 2026.
Official 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.
Weakness: CWE-248
Which versions are affected by CVE-2026-89315?
How do I fix CVE-2026-89315?
No fix has been published for CVE-2026-89315 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89315 being exploited?
There is no known exploitation of CVE-2026-89315 in the wild and no public exploit code.
Sources
Also known as GHSA-hwm6-rwv6-xgq8.