GHSA-253q-9q78-63x4
Clatter has a PSK Validity Rule Violation issue
Details
### 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)
Are you affected?
Enter the version of the package you're using.
Affected packages
0Fixed in: 2.2.0Upgrade clatter to 2.2.0 or newer (ecosystem crates.io).
References
- https://github.com/jmlepisto/clatter/security/advisories/GHSA-253q-9q78-63x4[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-24785[ADVISORY]
- https://github.com/jmlepisto/clatter/commit/b65ae6e9b8019bed5407771e21f89ddff17c5a71[WEB]
- https://github.com/jmlepisto/clatter[PACKAGE]
- https://noiseprotocol.org/noise.html#validity-rule[WEB]