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    CVE-2026-123609

    Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 contains an information disclosure vulnerability where derived Debug formatting of client session values exposes secret key material. Custom ClientSessionStore implementations that log Tls12ClientSessionValue or Tls13ClientSessionValue can leak TLS 1.2 master secrets or TLS 1.3 resumption PSKs to log readers.

    Published:Nov 8, 2026
    Last Modified:Nov 8, 2026
    EPS:Nov 8, 2026
    EPSS Score:
    CVSS Score:4

    Affected Products

    Vendor
    Rustls Project
    Product
    Rustls

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-168 Windows ::DATA Alternate Data Stream

    Related CVEs

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    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-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