# Apache Arrow Rust: Improper validation of RunEndEncoded arrays allows out of bounds reads

Advisory record · `GHSA-gqmm-qrjq-4c7h`

- **Identifiers:** `GHSA-gqmm-qrjq-4c7h` · `CVE-2026-111959` · `RUSTSEC-2026-0442`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) · [CWE-125](https://cwe.mitre.org/data/definitions/125.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md)
- **Published:** 2 Nov 2026
- **Updated:** 5 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 2 Nov 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `arrow-data` (crates.io): affected `>=33.0.0, <57.3.2 || >=58.0.0, <58.4.1 || >=59.0.0, <59.3.2 || >=60.0.0, <60.1.0`; fixed in `57.3.2`, `58.4.1`, `59.3.2`, `60.1.0`

## 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:** 0.0023, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 2 Nov 2026, 13:34 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-111959)
- 2 Nov 2026, 13:42 UTC: First seen by agentprime
- 2 Nov 2026, 14:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-111959)
- 5 Nov 2026, 09:00 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/RUSTSEC-2026-0442)

## Sources

- [GitHub Advisory Database: GHSA-gqmm-qrjq-4c7h](https://github.com/advisories/GHSA-gqmm-qrjq-4c7h)
- [OSV: GHSA-gqmm-qrjq-4c7h](https://osv.dev/vulnerability/GHSA-gqmm-qrjq-4c7h)
- <https://crates.io/crates/arrow-data>
- <https://rustsec.org/advisories/RUSTSEC-2026-0442.html>
- <https://www.openwall.com/lists/oss-security/2026/11/02/2>

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-gqmm-qrjq-4c7h>, 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-gqmm-qrjq-4c7h/>. Everything for agents: <https://agentprime.io/llms.txt>.