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CVE-2026-24785 — Vulnerability in clatter — CVE Details

HIGH

Clatter has a PSK Validity Rule Violation issue

Published January 28, 2026Updated February 3, 2026Source: osv

Summary

### Impact Protocol compliance vulnerability. The library allowed post-quantum handshake patterns that violated the PSK validity rule (Noise Protocol Framework Section 9.3). This could allow PSK-derived keys to be used for encryption without proper randomization by self-chosen ephemeral randomness, weakening security guarantees and potentially allowing catastrophic key reuse. Affected default patterns include `noise_pqkk_psk0`, `noise_pqkn_psk0`, `noise_pqnk_psk0`, `noise_pqnn_psk0`, and some hybrid variants. Users of these patterns may have been using handshakes that do not meet the intended security properties. ### Patches The issue is fully patched and released in Clatter v2.2.0. The fixed version includes runtime checks to detect offending handshake patterns. ### Workarounds Avoid using offending `*_psk0` variants of post-quantum patterns. Review custom handshake patterns carefully. ### Resources * [PSK validity rule](https://noiseprotocol.org/noise.html#validity-rule)

Advisory Timeline

  • First published January 28, 2026 (257 days ago).
  • Last revised February 3, 2026 — 5 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update clatter to 2.2.0 or later
cargo update -p clatter --precise 2.2.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
clatter
crates.io
All versions2.2.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-327
    Use of a Broken or Risky Cryptographic AlgorithmMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

References

Frequently Asked Questions

What is CVE-2026-24785?
Clatter has a PSK Validity Rule Violation issue This vulnerability has been assigned a severity rating of HIGH (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-24785?
CVE-2026-24785 affects clatter. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-24785 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-253q-9q78-63x4

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