High severity · published Oct 6, 2026
CVE-2026-105854
Payload: ReDoS in Multipart Content-Type Validation
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
payload · payloadcms
>= 3.0.0, < 3.90.0; >= 4.0.0-canary.0, < 4.0.0-canary.34 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105854
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105854
x_refsource_CONFIRM
https://github.com/payloadcms/payload/security/advisories/GHSA-2g7p-5934-q4w7
x_refsource_MISC
https://github.com/payloadcms/payload/commit/0084bd51fb7742b26a88431bb84cb1696857e6dc
x_refsource_MISC
https://github.com/payloadcms/payload/releases/tag/v3.90.0
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