GHSA-253q-9q78-63x4: clatter (CVE-2026-24785)

Package	Ecosystem	Affected	Fixed in
clatter	crates.io	<2.2.0	2.2.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Clatter versions before 2.2.0 allowed some post-quantum handshake patterns that violated the Noise PSK validity rule, including noise_pqkk_psk0, noise_pqkn_psk0, noise_pqnk_psk0, and noise_pqnn_psk0. The source gives few details on the exact attack, but it says PSK-derived keys could be used for encryption without proper ephemeral randomization, which could weaken security and enable key reuse. Upgrade to Clatter 2.2.0 or later, which adds runtime checks for offending patterns; until then, avoid the affected *_psk0 variants.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.0	High	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0014, the 3rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:19 UTC First seen by agentprime
31 Oct 2026, 15:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.