Missing Release of Resource after Effective Lifetime Affecting inflight package, versions *



    Attack Complexity Low
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept

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  • Snyk ID SNYK-JS-INFLIGHT-6095116
  • published 30 Nov 2023
  • disclosed 28 Nov 2023
  • credit jkomyno

Introduced: 28 Nov 2023

CVE NOT AVAILABLE CWE-772 Open this link in a new tab

How to fix?

There is no fixed version for inflight.


Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime via the makeres function due to improperly deleting keys from the reqs object after execution of callbacks. This behavior causes the keys to remain in the reqs object, which leads to resource exhaustion.

Exploiting this vulnerability results in crashing the node process or in the application crash.

Note: This library is not maintained, and currently, there is no fix for this issue. To overcome this vulnerability, several dependent packages have eliminated the use of this library.

To trigger the memory leak, an attacker would need to have the ability to execute or influence the asynchronous operations that use the inflight module within the application. This typically requires access to the internal workings of the server or application, which is not commonly exposed to remote users. Therefore, “Attack vector” is marked as “Local”.


const inflight = require('inflight');

function testInflight() {
  let i = 0;
  function scheduleNext() {
    let key = `key-${i++}`;
    const callback = () => {
    for (let j = 0; j < 1000000; j++) {
      inflight(key, callback);


  if (i % 100 === 0) {