Vulnerability Description
Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum support. Versiosn prior to2.2.0 have a 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. The issue is fully patched and released in Clatter v2.2.0. The fixed version includes runtime checks to detect offending handshake patterns. As a workaround, avoid using offending `*_psk0` variants of post-quantum patterns. Review custom handshake patterns carefully.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jmlepisto | Clatter | < 2.2.0 |
Related Weaknesses (CWE)
References
- https://github.com/jmlepisto/clatter/commit/b65ae6e9b8019bed5407771e21f89ddff17cPatch
- https://github.com/jmlepisto/clatter/security/advisories/GHSA-253q-9q78-63x4MitigationVendor Advisory
- https://noiseprotocol.org/noise.html#validity-ruleTechnical Description
FAQ
What is CVE-2026-24785?
CVE-2026-24785 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Clatter is a no_std compatible, pure Rust implementation of the Noise protocol framework with post-quantum support. Versiosn prior to2.2.0 have a protocol compliance vulnerability. The library allowed...
How severe is CVE-2026-24785?
CVE-2026-24785 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-24785?
Check the references section above for vendor advisories and patch information. Affected products include: Jmlepisto Clatter.