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CVE-2026-102824— Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange

Quick assessment

Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementation in russh/src/kex/hybrid_mlkem.rs accepts an all-zero 32-byte peer X25519 public key in both server_dh and compute_shared_secret, forcing the X25519

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-102824

Vulnerability Information

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Vulnerability Title
Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementation in russh/src/kex/hybrid_mlkem.rs accepts an all-zero 32-byte peer X25519 public key in both server_dh and compute_shared_secret, forcing the X25519 contribution to the combined shared secret to zero. A malicious SSH peer can therefore make the combined secret depend only on ML-KEM, defeating the hybrid exchange's intended fallback protection if ML-KEM is later weakened. This issue is fixed in version 0.63.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eugeny russh < 0.63.0 -

II. Public POCs for CVE-2026-102824

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III. Intelligence Information for CVE-2026-102824

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Other References for CVE-2026-102824 (3)

Same Patch Batch · Eugeny · 2026-09-29 · 6 CVEs total

CVE-2026-102823 7.5 HIGH russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never
CVE-2026-102821 6.5 MEDIUM Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
CVE-2026-102820 6.2 MEDIUM pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a mali
CVE-2026-102822 3.7 LOW russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-ind
CVE-2026-102825 3.7 LOW Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-327

V. Comments for CVE-2026-102824

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