# Remote DoS through unchecked \`IdList\` allocation in negentropy Advisory record · `RUSTSEC-2026-0365` - **Identifiers:** `RUSTSEC-2026-0365` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Published:** 14 Oct 2026 - **Updated:** 16 Oct 2026 - **Reviewed by a person:** No Published by OSV at 14 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `negentropy` (crates.io): affected `>=0.2.0, <0.4.4 || >=0.5.0, <0.5.2`; fixed in `0.4.4`, `0.5.2` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The negentropy crate on crates.io, versions 0.2.0 before 0.4.4 and 0.5.0 before 0.5.2, is vulnerable with the default std feature enabled. An unauthenticated remote attacker can send a small malformed reconciliation message that forces a huge memory allocation, aborting the application. Upgrade to negentropy 0.4.4 or 0.5.2. A message-size limit alone does not prevent this. 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-2026-0365) ## Sources - [OSV: RUSTSEC-2026-0365](https://osv.dev/vulnerability/RUSTSEC-2026-0365) - - - - - 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: .