# Peer minimum ACK delay can panic quinn-proto when ACK_FREQUENCY transmission is enabled Advisory record · `GHSA-3g6h-r5qx-f6hq` - **Identifiers:** `GHSA-3g6h-r5qx-f6hq` · `RUSTSEC-2026-0340` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Published:** 14 Sept 2026 - **Updated:** 12 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 14 Sept 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `quinn-proto` (crates.io): affected `>=0.11.0, <0.11.18`; fixed in `0.11.18` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Peer-supplied transport parameters can make quinn-proto panic: versions 0.11.0 up to but not including 0.11.18 of the quinn-proto crate are affected when sending ACK_FREQUENCY frames is enabled through the transport configuration. A remote peer that advertises a minimum ACK delay greater than its maximum ACK delay can trigger a panic while the connection is being driven, which crashes the process. Sending ACK_FREQUENCY frames is disabled by default, so only endpoints that opt in are affected. Upgrade quinn-proto to version 0.11.18 or later. 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 - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, 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-2026-0340) ## Sources - [GitHub Advisory Database: GHSA-3g6h-r5qx-f6hq](https://github.com/advisories/GHSA-3g6h-r5qx-f6hq) - [OSV: GHSA-3g6h-r5qx-f6hq](https://osv.dev/vulnerability/GHSA-3g6h-r5qx-f6hq) - - - 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: .