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Glob: AbortSignal cancellation bypass allows post-timeout filesystem traversalGHSA-3g3m-2fjr-6pw4

Fix: isaacs/node-glob@4682e8c

GHSA-3g3m-2fjr-6pw4 is a Uncontrolled Resource Consumption vulnerability in glob. A fix is available for glob — see the affected versions and patch details below.

Also known asCVE-2026-118773
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-3g3m-2fjr-6pw4.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs29th percentile — riskier than 29% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected
📦glob

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.

Description

Summary

In glob 13.0.6, an aborted async walk rejects or emits an error but continues recursively reading directories in the background.

The root cause is that abort branches in src/walker.ts call cb() without returning. As a result, callers that rely on signal or AbortSignal.timeout() to bound glob traversal cost can still incur filesystem I/O and CPU work after the request has already been rejected.

Details

This was reproduced on glob v13.0.6 (commit e80cb38ae60d6cbff9e75f39032a994858994d35).

The README documents that the signal option cancels the glob walk. However, in src/walker.ts, the following methods call cb() when this.signal?.aborted is true but do not return:

  • GlobUtil.walkCB()
  • GlobUtil.walkCB2()
  • GlobUtil.walkCBSync()
  • GlobUtil.walkCB2Sync()

Example vulnerable pattern:

if (this.signal?.aborted) cb()

Because execution continues after cb(), the walker still reaches processor.processPatterns(), readdirCB(), and recursive walkCB2() calls.

The issue was directly demonstrated against v13.0.6. A source-history review shows the same missing-return pattern is present in tagged releases from v9.0.0 through v13.0.6.

The issue affects both glob() and globStream().

Recommended fix: Change each abort branch to return immediately:

if (this.signal?.aborted) return cb()

Proof of concept

Environment:

  • Linux x86_64
  • Node.js v22.23.3
  • npm 10.9.9
  • glob 13.0.6

Reproduction steps:

  1. Install the affected package: npm init -y npm install [email protected]

  2. Run the attached PoC: node poc/abort-continues-work.mjs

The PoC aborts after the first readdir() call, waits briefly, and counts how many more directory reads happen after the promise has already rejected.

Observed output on the vulnerable version:

{ "rejection": "Error: probe-abort", "readdirCalls": 1365, "readdirCallsAtReject": 5, "readdirCallsAfterReject": 1360 }

Expected behavior: readdirCallsAfterReject should be 0.

A second PoC using AbortSignal.timeout() also reproduces the issue:

{ "rejection": "TimeoutError: The operation was aborted due to timeout", "readdirCalls": 133, "readdirCallsAtReject": 1, "readdirCallsAfterReject": 132 }

The same test against a patched build with return cb() in the four abort branches stops immediately:

{ "readdirCalls": 1, "readdirCallsAtReject": 1, "readdirCallsAfterReject": 0 }

Impact

This is an availability issue.

Applications that expose globbing over attacker-influenced patterns or attacker-controlled directory trees and use AbortSignal / AbortSignal.timeout() as a traversal budget can still perform significant filesystem I/O and CPU work after a request has already timed out or been canceled.

Repeated timed-out requests can stack background glob walks and degrade worker throughput or service availability.

No confidentiality or integrity impact was observed.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmglob≥ 9.0.0&&< 14.0.214.0.2npm install glob@14.0.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for glob, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update glob to 14.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3g3m-2fjr-6pw4 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Summary In glob 13.0.6, an aborted async walk rejects or emits an error but continues recursively reading directories in the background. The root cause is that abort branches in src/walker.ts call cb() without returning. As a result, callers that rely on signal or AbortSignal.timeout() to bound glob traversal cost can still incur filesystem I/O and CPU work after the request has already been rejected. ### Details This was reproduced on glob v13.0.6 (commit e80cb38ae60d6cbff9e75f39032a994858994d35). The README documents that the signal option cancels the glob walk. However, in src/walk
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