# Hybrid Encapsulation from Seed Panics on Short Seed Advisory record · `RUSTSEC-2026-0330` - **Identifiers:** `RUSTSEC-2026-0330` - **State:** Confirmed - **Severity:** CVSS 4.0, no score published - **Critical:** No - **Published:** 28 Sept 2026 - **Updated:** 7 Oct 2026 - **Reviewed by a person:** No Published by OSV at 28 Sept 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `libcrux-kem` (crates.io): affected `>=0.0.0-0, <0.0.10`; fixed in `0.0.10` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > libcrux-kem versions before 0.0.10 can panic when the PublicKey::encapsulate_derand function is called with a seed shorter than 32 bytes on a hybrid KEM public key of type WingKemDraft06 or X25519MlKem768Draft06. An attacker would need to control the seed value used for encapsulation, which causes the application to panic. Upgrade libcrux-kem to version 0.0.10, and do not take the encapsulation seed from an untrusted source. Written 3 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 not published, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`, from OSV - **CISA KEV:** Not listed. - **EPSS:** No score. ## Timeline - 31 Oct 2026, 14:24 UTC: First seen by agentprime - 31 Oct 2026, 14:24 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/RUSTSEC-2026-0330) ## Sources - [OSV: RUSTSEC-2026-0330](https://osv.dev/vulnerability/RUSTSEC-2026-0330) - - - 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. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .