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    CVE-2026-123612

    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.

    Published:Nov 8, 2026
    Last Modified:Nov 8, 2026
    EPS:Nov 8, 2026
    EPSS Score:
    CVSS Score:2.3

    Affected Products

    Vendor
    Rustls Project
    Product
    Rustls

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-696 Incorrect Behavior Order

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack

    Related CVEs

    CVE-2026-123613 (CVSS 6.9) — Rustls from 0.23.13 before 0.23.45 accepts TLS 1.3 handshake messages at the wrong encryption level when they …
    CVE-2026-123611 (CVSS 6.3) — rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison …
    CVE-2026-123610 (CVSS 6.3) — rustls before 0.23.46 contains an uncontrolled memory allocation flaw in its optional Brotli certificate decom…
    CVE-2026-123609 (CVSS 4.1) — Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 contains an information disclosure vulnerability wh…
    CVE-2024-11738 (CVSS 5.3) — A flaw was found in Rustls 0.23.13 and related APIs. This vulnerability allows denial of service (panic) via a…
    CVE-2024-32650 (CVSS 7.5) — Rustls is a modern TLS library written in Rust. `rustls::ConnectionCommon::complete_io` could fall into an inf…
    CVE-2019-15541 (CVSS 7.5) — rustls-mio/examples/tlsserver.rs in the rustls crate before 0.16.0 for Rust allows attackers to cause a denial…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High