ReDoS vulnerability in vue package that is exploitable through inefficient regex evaluation in the parseHTML function

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2024-9506: 0.57% estimated exploitation activity in the next 30 days; percentile 47.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The ReDoS can be exploited through the parseHTML function in the html-parser.ts file. This flaw allows attackers to slow down the application by providing specially crafted input that causes inefficient processing of regular expressions, leading to excessive resource consumption. To demonstrate this vulnerability, here's an example. In a Vue client-side application, create a new Vue instance with a template string that includes a <script tag but closes it incorrectly with something like </textarea. Next, set up a basic HTML page (e.g., index.html) to load this JavaScript and mount the Vue instance: When you visit the app in your browser at http://localhost:3000, you'll notice that the time taken to parse and mount the Vue application increases significantly due to the ReDoS vulnerability, demonstrating how the flaw can affect performance.

Published by the source

15 Oct 2024, 18:30 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:31 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-5j4c-8p2g-v4jx

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-5j4c-8p2g-v4jx

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# Patch Next advisory brief: CVE-2024-9506

Advisory: ReDoS vulnerability in vue package that is exploitable through inefficient regex evaluation in the parseHTML function
IDs: CVE-2024-9506, GHSA-5j4c-8p2g-v4jx
Record: https://patchnext.com/advisories/cve-2024-9506 (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: vue 3.0.0-alpha.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm vue: affected >= 2.0.0-alpha.1, < 3.0.0-alpha.0; fixed in 3.0.0-alpha.0

## Suggested inspection (read-only)
- `npm ls vue --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on vue.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-5j4c-8p2g-v4jx (OSV record GHSA-5j4c-8p2g-v4jx lists affected ranges: npm vue >=2.0.0-alpha.1 <3.0.0-alpha.0 (fixed))
- Verified: https://github.com/advisories/GHSA-5j4c-8p2g-v4jx (GitHub-reviewed advisory GHSA-5j4c-8p2g-v4jx lists affected ranges: npm vue >=2.0.0-alpha.1 <3.0.0-alpha.0)

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