Vulnerability · Published Oct 23, 2026 · Assigned by eclipse
CVE-2026-89313JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is absent, instead of nil
Medium 6.3
In plain English
A medium-severity security flaw in Eclipse KeyPont - GOSE from Eclipse Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).
Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.3%top 71.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
`JwksTrustStore.Get` assigned each parsed key to the function's **named return value** while refreshing the JWKS cache. When the requested `kid` was not present, the trailing naked `return` handed the caller the last key in the JWKS document together with a `nil` error — a confidently wrong answer instead of "not found".
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Eclipse Foundation | Eclipse KeyPont - GOSE | 0.7.5 – through 0.13.0-rc1 |
| Eclipse Foundation | Eclipse KeyPont - GOSE | 0 – before 1.0.0-rc4 |
Weakness: CWE-706 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N