# CVE-2026-89317: JwtVerifierImpl.Verify does not enforce the JWS `crit` header (RFC 7515 §4.1.11)

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

gose parsed the JWS `crit` header into `JwsHeader.Crit` and then never read it. RFC 7515 §4.1.11 requires a recipient to reject a JWS whose listed critical extension parameters it does not understand. gose implements no header extensions, so every token carrying a non-empty `crit` should have been rejected — and none were.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Eclipse Foundation / Eclipse KeyPont - GOSE (github.com/ThalesGroup/gose): ≥ 0.7.3; ≤ 0.13.0-rc1 (affected, semver). Source: CNA: eclipse
- Eclipse Foundation / Eclipse KeyPont - GOSE (github.com/eclipse-keypont/gose): ≥ 0; < 1.0.0-rc4 (affected, semver). Source: CNA: eclipse

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); 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; source: CNA: eclipse

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-01; percentile 3.90%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-20, CWE-347, CWE-1288

## Exploit evidence

- exploit: https://github.com/eclipse-keypont/gose/security/advisories/GHSA-445r-fpvv-hgwc (ADP: CISA-ADP)

## References

- https://github.com/eclipse-keypont/gose/security/advisories/GHSA-445r-fpvv-hgwc (CNA: eclipse)

- https://github.com/eclipse-keypont/gose/security/advisories/GHSA-445r-fpvv-hgwc (ADP: CISA-ADP; exploit)

## Provenance

- CNA: eclipse: https://www.cve.org/CVERecord?id=CVE-2026-89317; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-89317; retrieved 2026-11-02; source updated Not reported

Revision: dfe94c656aea437db88e67bb642f1d781e1be612c1f516058c797342f78689a5

Canonical: https://y2.dev/cve/CVE-2026-89317

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