RUSTSEC-2026-0451

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    RUSTSEC-2026-0451

    Published: 6 Nov 2026Last Modified: 6 Nov 2026

    Summary: Degraded secret zeroization capabilities

    Details: In version 0.11.1 and earlier of vodozemac, the Olm root key ratchet did not zeroize its HKDF output after use. Each ratchet step left a copy of the new root key and chain key in freed heap memory. ## Impact An attacker who can read the process's memory, for example through a separate memory-disclosure bug, a core dump, or swapped-out pages, may recover root keys and chain keys from earlier ratchet steps. A leaked chain key allows decrypting the messages in that chain, weakening Olm's forward secrecy for affected sessions.

    References: https://crates.io/crates/vodozemac, https://rustsec.org/advisories/RUSTSEC-2026-0451.html, https://github.com/matrix-org/vodozemac/pull/446

    Affected packages

    Package

    Name: vodozemac

    Purl: pkg:cargo/vodozemac

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0.0.0-0
    Fixed -0.11.2

    Affected versions

    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
    RUSTSEC-2026-0451 | CVE-DB