CVE-2026-105854 Payload: ReDoS in Multipart Content-Type Validation
Attackers can cause denial of service in Payload CMS by sending malformed multipart requests that trigger excessive resource consumption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105854?
CVE-2026-105854 is a high-severity denial of service vulnerability in payloadcms payload, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Payload is a free and open source headless content management system. In versions from 3.0.0 before 3.90.0 and canary versions before 4.0.0-canary.34, a malformed multipart request body can cause multipart Content-Type processing to take an extremely long time, resulting in uncontrolled resource consumption. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Which versions are affected by CVE-2026-105854?
4 open source packages ship an affected version, including payload. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
payload npm | From 3.0.0 | 3.90.0 |
payload npm | From 3.0.0 | 3.90.0 |
payload npm | From 4.0.0-canary.0 | 4.0.0-canary.34 |
payload npm | From 4.0.0-canary.0 | 4.0.0-canary.34 |
Products include Payloadcms Payload.
How do I fix CVE-2026-105854?
Upgrade payload to a fixed version for your release line: 3.90.0 or 4.0.0-canary.34.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-105854 being exploited?
There is no known exploitation of CVE-2026-105854 in the wild and no public exploit code.
Other vulnerabilities in payloadcms payload
- CVE-2026-105857 Payload: RCE in Payload Form Builder
- CVE-2026-105859 Payload: Unauthorized update to collection documents
- CVE-2026-25544 Payload has an SQL Injection in JSON/RichText Queries on PostgreSQL/SQLite Adapters
- CVE-2022-27952 Unrestricted Upload of File with Dangerous Type in Payload
- CVE-2026-105851 Payload: Field access control bypass on auth collections
Sources
Also known as GHSA-2g7p-5934-q4w7.