GHSA-rvr2-r3pv-5m4p: Oneshot Oneshot Has Potential Use After Vulnerability

HIGH
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CWE-362 CWE-416
Published
Advisory Summary

GHSA-rvr2-r3pv-5m4p is a HIGH oneshot has potential use after vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Oneshot libraries in the crates.io ecosystem. The issue involves oneshot has potential use after free when used asynchronously. Remediation is available by upgrading affected packages to version 0.1.12.

GHSA-rvr2-r3pv-5m4p at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-rvr2-r3pv-5m4p
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Oneshot
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-rvr2-r3pv-5m4p

To remediate this vulnerability, upgrade all affected Oneshot dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

oneshot fixed: 0.1.12 
Upgrade oneshot to 0.1.12
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for oneshot

How to Check if You Are Affected

To determine whether your application is affected by GHSA-rvr2-r3pv-5m4p, inspect your project dependencies for Oneshot:

inspect dependencies for oneshot

Analyze the terminal output to locate any version of Oneshot in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.12), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Oneshot, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

There is a race condition that can lead to a use-after-free if a `oneshot::Receiver` is polled but then dropped instead of polled to completion. This could happen if the receiver future was cancelled while receiving, for example by being wrapped in a timeout future or similar. When the `Receiver` is polled (`Future::poll`) it writes a waker to the channel and sets it to the `RECEIVING` state. If the `Receiver` was then dropped (instead of polled to completion), the `Drop` implementation on `Receiver` unconditionally swapped the channel state to `DISCONNECTED` and only after doing so it read back its waker from the heap allocation and dropped it. The problem is that the `DISCONNECTED` state could be observed by the `Sender`, which would lead to it deallocating the channel heap memory. If the `Sender` manage to free the channel before the `Receiver` managed to proceed to dropping the waker, then the `Receiver` would read from the freed channel memory (Use After Free). The fix was submitted in https://github.com/faern/oneshot/pull/74 and published as part of `oneshot` version `0.1.12`.

GHSA-rvr2-r3pv-5m4p Affected Oneshot Versions

1 component(s)
Fixed Versions:
0.1.12
Product / Package Ecosystem Affected Versions Fixed Version
oneshot
 crates.io
< 0.1.12
0.1.12

References

Oneshot Source Repository REPOSITORY
https://github.com/faern/oneshot/issues/73
Oneshot Source Repository REPOSITORY
https://github.com/rustsec/advisory-db/pull/2600
Security Fix Commit FIX COMMIT
https://github.com/faern/oneshot/commit/d1a1506010bc48962634807d0dcca682af4f50ba
Oneshot Source Repository REPOSITORY
https://github.com/faern/oneshot
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0005.html

Frequently Asked Questions

What is GHSA-rvr2-r3pv-5m4p?
GHSA-rvr2-r3pv-5m4p is a security vulnerability in Oneshot involving oneshot has potential Use After Free when used asynchronously under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Oneshot versions are affected?
Affected versions include releases prior to 0.1.12 across affected packages: oneshot.
What version fixes GHSA-rvr2-r3pv-5m4p?
Upgrading to 0.1.12 (or the latest patched release for your respective branch) resolves the vulnerability.
Is oneshot affected?
Yes, oneshot is affected in releases prior to 0.1.12. Upgrade your dependency to 0.1.12 or later.
What CWE is associated with GHSA-rvr2-r3pv-5m4p?
GHSA-rvr2-r3pv-5m4p is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check crates.io dependencies for GHSA-rvr2-r3pv-5m4p?
Run the dependency tree command: 'inspect dependencies for oneshot'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rvr2-r3pv-5m4p",
  "modified" : "2026-01-27T00:59:05Z",
  "published" : "2026-01-27T00:59:04Z",
  "aliases" : [ ],
  "summary" : "oneshot has potential Use After Free when used asynchronously",
  "details" : "There is a race condition that can lead to a use-after-free if a `oneshot::Receiver` is polled but then dropped instead of polled to completion. This could happen if the receiver future was cancelled while receiving, for example by being wrapped in a timeout future or similar.\n\nWhen the `Receiver` is polled (`Future::poll`) it writes a waker to the channel and sets it to the `RECEIVING` state. If the `Receiver` was then dropped (instead of polled to completion), the `Drop` implementation on `Receiver` unconditionally swapped the channel state to `DISCONNECTED` and only after doing so it read back its waker from the heap allocation and dropped it. The problem is that the `DISCONNECTED` state could be observed by the `Sender`, which would lead to it deallocating the channel heap memory. If the `Sender` manage to free the channel before the `Receiver` managed to proceed to dropping the waker, then the `Receiver` would read from the freed channel memory (Use After Free).\n\nThe fix was submitted in https://github.com/faern/oneshot/pull/74 and published as part of `oneshot` version `0.1.12`.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "oneshot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.12"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/faern/oneshot/issues/73"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rustsec/advisory-db/pull/2600"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/faern/oneshot/commit/d1a1506010bc48962634807d0dcca682af4f50ba"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/faern/oneshot"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0005.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362", "CWE-416" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-27T00:59:04Z",
    "nvd_published_at" : null
  }
}