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    CVE-2026-102822

    Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.

    Published:Sep 29, 2026
    Last Modified:Sep 29, 2026
    EPS:Sep 29, 2026
    EPSS Score:
    CVSS Score:3.7

    Affected Products

    Vendor
    Eugeny
    Product
    Russh

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-100 Overflow Buffers

    Related CVEs

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    CVE-2026-116773 (CVSS 4.3) — russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.6…
    CVE-2026-116696 (CVSS 3.3) — russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.6…
    CVE-2026-111061 (CVSS 4.3) — russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.6…
    CVE-2026-102825 (CVSS 3.7) — Russh is a Rust SSH client and server library. Prior to 0.62.6, the USERAUTH_REQUEST path reached from server:…
    CVE-2026-102824 (CVSS 4.3) — Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementatio…
    CVE-2026-102823 (CVSS 7.5) — Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/…
    CVE-2026-102821 (CVSS 6.5) — Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_…

    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