# Rust XCB \`xcb::Connection::connect_to_fd\*\` functions violate I/O safety

Advisory record · `GHSA-655h-hg88-5qmf`

- **Identifiers:** `GHSA-655h-hg88-5qmf` · `RUSTSEC-2025-0051`
- **State:** Confirmed
- **Severity:** CVSS 4.0, no score published
- **Critical:** No
- **Weakness (CWE):** [CWE-666](https://cwe.mitre.org/data/definitions/666.html) · [CWE-672](https://cwe.mitre.org/data/definitions/672.html)
- **Tags:** [CWE-666](https://agentprime.io/advisories/tag/cwe-666.md) · [CWE-672](https://agentprime.io/advisories/tag/cwe-672.md)
- **Published:** 22 Aug 2025
- **Updated:** 28 Oct 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Aug 2025, 17:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `xcb` (crates.io): affected `<1.6.0`; fixed in `1.6.0`

## 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

- Score not published, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 15:19 UTC: First seen by agentprime
- 31 Oct 2026, 15:19 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-655h-hg88-5qmf)

## Sources

- [GitHub Advisory Database: GHSA-655h-hg88-5qmf](https://github.com/advisories/GHSA-655h-hg88-5qmf)
- [OSV: GHSA-655h-hg88-5qmf](https://osv.dev/vulnerability/GHSA-655h-hg88-5qmf)
- <https://github.com/rust-x-bindings/rust-xcb/issues/167>
- <https://github.com/rust-x-bindings/rust-xcb/issues/282>
- <https://github.com/rust-x-bindings/rust-xcb/pull/283>
- <https://github.com/rustsec/advisory-db/pull/2355>
- <https://github.com/rust-x-bindings/rust-xcb/commit/da830976870c1174e3b33eb0643177be3991c002>
- <https://github.com/rust-x-bindings/rust-xcb>
- <https://rustsec.org/advisories/RUSTSEC-2025-0051.html>

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-655h-hg88-5qmf>, 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-655h-hg88-5qmf/>. Everything for agents: <https://agentprime.io/llms.txt>.