CVE-2026-123612

EUVD-2026-119371
rustls 0.23.44 and 0.23.45 contain an information disclosure vulnerability that sends application data buffered before the handshake completes to the client-facing server when Encrypted Client Hello is rejected. Because start_traffic() queues plaintext from ClientConnection::writer() before sending the ech_required alert, the authenticated public_name server receives data intended for the inner server.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
2.3 LOW
LOCAL
LOW
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 1.26%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
rustls_projectrustls
0.23.44 ≤
𝑥
< 0.23.46
CNA
Debian logo
Debian Releases
Debian Product
Codename
rust-rustls
bookworm
vulnerable
forky
vulnerable
sid
0.23.46+ds-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/rustls/rustls/security/advisories/GHSA-vp88-798v-h67f
https://www.vulncheck.com/advisories/rustls-0.23.44-and-0.23.45-ech-rejection-application-data-disclosure