# Out-of-bounds read in \`train_from_buffer\` when sample sizes overflow Advisory record · `RUSTSEC-2026-0401` - **Identifiers:** `RUSTSEC-2026-0401` - **State:** Confirmed - **Severity:** No CVSS score - **Critical:** No - **Published:** 16 Oct 2026 - **Updated:** 2 Nov 2026 - **Reviewed by a person:** No Published by OSV at 16 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `zstd-safe` (crates.io): affected `>=0.0.0-0, <7.4.0 || >=8.0.0-0, <8.2.0`; fixed in `7.4.0`, `8.2.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Versions of zstd-safe before 7.4.0, and from 8.0.0 before 8.2.0, are affected by an out-of-bounds read in train_from_buffer when the sample sizes overflow. The read happens in release builds, where the size sum wraps around, and it requires sample sizes from an untrusted source. Upgrade zstd-safe to 7.4.0 or 8.2.0 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 No source has published a CVSS score for this record yet. - **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-2026-0401) ## Sources - [OSV: RUSTSEC-2026-0401](https://osv.dev/vulnerability/RUSTSEC-2026-0401) - - - - 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: .