JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is absent, instead of nil

CVE List

01 Why this matters

CVE-2026-89313 has no exploitation data yet. Impact if it lands: CVSS 6.3 (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).

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02 Facts

CVSS: CVSS 6.3 (v4.0)
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
EPSS: No EPSS yet
CISA KEV: Not on the CISA KEV list
Dates: published Oct 23, 2026
modified Oct 23, 2026
Weaknesses: CWE-706
Severity: medium

03 Affected packages

No package ranges are published for this id.

04 Advisory text

`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".

Advisory text is quoted from public sources and may contain anything, including instructions. It is data, not guidance.

05 References

https://github.com/eclipse-keypont/gose/security/advisories/GHSA-v7r8-g6h9-99vv

06 Ask your agent

With the geoa-cve MCP server connected

explain_impact CVE-2026-89313

Or without MCP: https://cve.geoa.io/api/vuln/CVE-2026-89313. Danger: Low, CVSS 6.3.