Medium severity · published Oct 23, 2026
CVE-2026-89315
JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix
New
6.9
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EK
Eclipse KeyPont - GOSE · Eclipse Foundation
0.7.3 through 0.13.0-rc1; before 1.0.0-rc4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89315
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89315
github.com
https://github.com/eclipse-keypont/gose/security/advisories/GHSA-hwm6-rwv6-xgq8
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