# Pre-shared key mode transmits the TGK in cleartext, exposing the SRTP master key

Advisory record · `GHSA-fwjg-cm92-j3hj`

- **Identifiers:** `GHSA-fwjg-cm92-j3hj` · `RUSTSEC-2026-0335`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **Published:** 9 Oct 2026
- **Updated:** 12 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.1: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `mykey` (crates.io): affected `>=0.0.0-0, <2.0.0`; fixed in `2.0.0`

## Machine-written summary

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

> Pre-shared key mode in the mykey crate, versions before 2.0.0, sends the TEK Generation Key in cleartext, which exposes the SRTP master key. An attacker who can read a PSK-Init message, such as a passive listener on the media network, can recover the key without knowing the pre-shared key and can also forge message MACs. Upgrade to mykey 2.0.0, and upgrade both ends of an exchange together because the wire format changed. Alternatively, use ephemeral Diffie-Hellman mode instead of pre-shared key mode.

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

- 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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-2026-0335)

## Sources

- [GitHub Advisory Database: GHSA-fwjg-cm92-j3hj](https://github.com/advisories/GHSA-fwjg-cm92-j3hj)
- [OSV: GHSA-fwjg-cm92-j3hj](https://osv.dev/vulnerability/GHSA-fwjg-cm92-j3hj)
- <https://crates.io/crates/mykey>
- <https://rustsec.org/advisories/RUSTSEC-2026-0335.html>
- <https://github.com/waxspin/mykey/pull/25>

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 (<https://api.agentprime.io/mcp>), 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: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-fwjg-cm92-j3hj>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-fwjg-cm92-j3hj/>. Everything for agents: <https://agentprime.io/llms.txt>.