CVE-2026-113656 ApostropheCMS: Unauthenticated unbounded multipart upload → disk-exhaustion DoS
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113656?
CVE-2026-113656 is a medium-severity vulnerability in @apostrophecms apostrophe, published on 20 Oct 2026.
Official description
ApostropheCMS is an open-source Node.js content management system. Prior to 1.5.5 of the ApostropheCMS Form add-on, its form submission route stages unbounded multipart uploads before form validation or authentication and lacks upload size, count, and rate limits. Repeated unauthenticated submissions can consume temporary disk storage and disrupt form handling or other host services. This issue is fixed in ApostropheCMS Form 1.5.5.
Weakness: CWE-770
Which versions are affected by CVE-2026-113656?
2 open source packages ship an affected version, including @apostrophecms/form.
| Package | Affected | Fixed in |
|---|---|---|
@apostrophecms/form npm | All versions | 1.5.5 |
@apostrophecms/form npm | All versions | 1.5.5 |
How do I fix CVE-2026-113656?
Upgrade @apostrophecms/form to 1.5.5 or later.
Is CVE-2026-113656 being exploited?
There is no known exploitation of CVE-2026-113656 in the wild and no public exploit code.
Sources
Also known as GHSA-89mh-mm8c-mv7f.