# Race condition in \`tokio::time::Interval\` on Tokio v1.54.0

Advisory record · `GHSA-5wjr-9356-4wc8`

- **Identifiers:** `GHSA-5wjr-9356-4wc8` · `CVE-2026-115567` · `RUSTSEC-2026-0384`
- **State:** Confirmed
- **Severity:** CVSS 5.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-362](https://cwe.mitre.org/data/definitions/362.html)
- **Tags:** [Race condition](https://agentprime.io/advisories/tag/race-condition.md)
- **Published:** 21 Oct 2026
- **Updated:** 24 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 21 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `tokio` (crates.io): affected `>=1.54.0, <1.54.1`; fixed in `1.54.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Tokio versions 1.54.0 (affected range >=1.54.0, <1.54.1) have a race condition in tokio::time::Interval on the multi-threaded runtime, where Interval::poll_tick or .tick().await can drop a timer entry without synchronizing with the time driver. The source says this can cause data races and use-after-free conditions, leading to crashes, panics, or memory corruption, with no attacker action described beyond normal use of Interval. Upgrade to tokio 1.54.1, which contains the fix.

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

- 5.8 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0011, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## 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-2026-0384)

## Sources

- [GitHub Advisory Database: GHSA-5wjr-9356-4wc8](https://github.com/advisories/GHSA-5wjr-9356-4wc8)
- [OSV: GHSA-5wjr-9356-4wc8](https://osv.dev/vulnerability/GHSA-5wjr-9356-4wc8)
- <https://crates.io/crates/tokio>
- <https://rustsec.org/advisories/RUSTSEC-2026-0384.html>
- <https://github.com/tokio-rs/tokio/pull/8692>

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-5wjr-9356-4wc8>, 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-5wjr-9356-4wc8/>. Everything for agents: <https://agentprime.io/llms.txt>.