CVE-2026-26994 affects uTLS versions 1.6.7 and below, where it failed to implement TLS 1.3 downgrade protection. An active network adversary could exploit this by modifying ClientHello messages to force a downgrade to older, less secure TLS versions like 1.2, without detection by the uTLS client. This vulnerability is rated Medium (CVSS 6.5), requiring no user interaction and having low impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.7.0CPE matchmatch criteria | cpe:2.3:a:refraction-networking:utls:*:*:*:*:*:go:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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