Vulnerability Description
Insufficient Session Expiration vulnerability in OAuth token issuance in hexpm hexpm allows a user whose organization membership or session has ended to keep reading the organization's private packages and their documentation tarballs via a retained refresh token. generate_refresh_token/4 in lib/hexpm/oauth/jwt.ex signs the refresh token with the same iss, aud and scope claims as the access token, so it carries the same repository:<org> scopes. The CDN service that serves private repositories verifies the signature and time claims and then authorizes from the scope claim, with no database lookup and no way to tell the two token kinds apart. Removing a member or revoking a session therefore takes effect at the CDN only when the 30 day refresh token expires, instead of after the 30 minute access token lifetime. Access is read-only and limited to organizations the account belonged to when the token was granted. This issue affects hex.pm: from 2025-10-10 before 2026-09-22.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-86698.html
- https://github.com/hexpm/hexpm/commit/650faa03af511e74c1b3b49ec12d35666b6984c4
- https://github.com/hexpm/hexpm/commit/db58cf3a86c7639708ef52ff86de0b4f938e6360
- https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f
- https://osv.dev/vulnerability/EEF-CVE-2026-86698
- https://github.com/hexpm/hexpm/security/advisories/GHSA-vmw7-7g2w-gw2f
FAQ
What is CVE-2026-86698?
CVE-2026-86698 is a documented vulnerability. Insufficient Session Expiration vulnerability in OAuth token issuance in hexpm hexpm allows a user whose organization membership or session has ended to keep reading the organization's private package...
How severe is CVE-2026-86698?
CVSS scoring is not yet available for CVE-2026-86698. Check NVD for updates.
Is there a patch for CVE-2026-86698?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.