CVE-2026-26994
uTLS ServerHellos are accepted without checking TLS 1.3 downgrade canaries
Impact
### Description Before version 1.7.0, utls did not implement the TLS 1.3 downgrade protection mechanism specified in RFC 8446 Section 4.1.3 when using a utls ClientHello spec. This allowed an active network adversary to downgrade TLS 1.3 connections initiated by a utls client to a lower TLS version (e.g., TLS 1.2) by modifying the ClientHello message to exclude the SupportedVersions extension, causing the server to respond with a TLS 1.2 ServerHello (along with a downgrade canary in the ServerHello random field). Because utls did not check the downgrade canary in the ServerHello random field, clients would accept the downgraded connection without detecting the attack. This attack could also be used by an active network attacker to fingerprint utls connections. ### Fix Commit or Pull Request refraction-networking/utls#337, specifically refraction-networking/utls@f8892761e2a4d29054264651d3a86fda83bc83f9 ### References - https://github.com/refraction-networking/utls/issues/181
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/refraction-networking/utls | < 1.7.0 | 1.7.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Refraction-Networking | Utls | before 1.7.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/refraction-networking/utls/commit/f8892761e2a4d29054264651d3a86fda83bc83f9
- https://github.com/refraction-networking/utls/issues/181
- https://github.com/refraction-networking/utls/pull/337
- https://github.com/refraction-networking/utls/security/advisories/GHSA-pmc3-p9hx-jq96
- https://github.com/advisories/GHSA-pmc3-p9hx-jq96
- https://nvd.nist.gov/vuln/detail/CVE-2026-26994