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CVE-2026-24785

Jmlepisto Clatter vulnerability

9.1 CRITICALEPSS 0.14%
  1. Published27 Jan 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Jmlepisto Clatter< 2.2.0

Remediation

Fixed in
Jmlepisto Clatter≥ 2.2.0

References

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Frequently asked

Is CVE-2026-24785 being actively exploited?

CVE-2026-24785 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.14%.

How severe is CVE-2026-24785?

CVE-2026-24785 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.14% probability of exploitation.

Which products are affected by CVE-2026-24785?

Affected products include Jmlepisto Clatter.

How do I fix CVE-2026-24785?

Upgrade affected software to a fixed version, for example Jmlepisto Clatter 2.2.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.