# Panic-safety unsoundness in \`SplitVec::extend_from_slice\` (uninitialized read) Advisory record · `RUSTSEC-2026-0252` - **Identifiers:** `RUSTSEC-2026-0252` - **State:** Confirmed - **Severity:** No CVSS score - **Critical:** No - **Published:** 11 Aug 2026 - **Updated:** 11 Aug 2026 - **Reviewed by a person:** No Published by OSV at 11 Aug 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `orx-split-vec` (crates.io): affected `>=0.0.0-0, <4.0.0`; fixed in `4.0.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > SplitVec in the orx-split-vec crate, versions before 4.0.0, is affected. If an element's Clone implementation panics during SplitVec::extend_from_slice, the vector's length is left counting slots that were never initialized, and later safe reads such as get, indexing, or iter can read those uninitialized slots. Upgrade to orx-split-vec 4.0.0 or later, which no longer commits the length before cloning elements. Written 8 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, 15:18 UTC: First seen by agentprime - 31 Oct 2026, 15:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/RUSTSEC-2026-0252) ## Sources - [OSV: RUSTSEC-2026-0252](https://osv.dev/vulnerability/RUSTSEC-2026-0252) - - 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: .