What is CVE-2026-79664?

CVE-2026-79664 is a high-severity vulnerability in Lin-Snow Ech0, classified under Insufficient Session Expiration. CVSS score: 7.4/10. Published 2026-08-25.

How severe is CVE-2026-79664?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Lin-Snow Ech0

CVE-2026-79664

Ech0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers to maintain perpetual authenticated access after token theft. Three independent revocation mechanisms fail: logout panics on nil ExpiresAt field, RevokeToken skips when remainTTL is zero, and admin delete does not blacklist the JTI, leaving stolen tokens cryptographically valid until JWT secret rotation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Lin-snow Ech0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-79664?: CVE-2026-79664 is a high-severity vulnerability in Lin-Snow Ech0, classified under Insufficient Session Expiration. CVSS score: 7.4/10. Published 2026-08-25.
How severe is CVE-2026-79664?: High severity. CVSS v3 base score is 7.4 out of 10.