CVE-2026-27129
February 24, 2026
Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation uses "gethostbyname()", which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437. Exploitation requires GraphQL schema permissions for editing assets in the "<VolumeName>" volume and creating assets in the "<VolumeName>" volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue.
Affected Packages
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.8.0 <5.8.23Fix Suggestion:
Update to version 5.8.23https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.16.0 <4.16.19Fix Suggestion:
Update to version 4.16.19https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.8.0 <5.8.23Fix Suggestion:
Update to version 5.8.23https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.16.0 <4.16.19Fix Suggestion:
Update to version 4.16.19https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.16.0 <4.16.19Fix Suggestion:
Update to version 4.16.19https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.8.0 <5.8.23Fix Suggestion:
Update to version 5.8.23https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.16.0 <4.16.19Fix Suggestion:
Update to version 4.16.19craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19Fix Suggestion:
Update to version 4.16.19craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23Fix Suggestion:
Update to version 5.8.23craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23Fix Suggestion:
Update to version 5.8.23craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19Fix Suggestion:
Update to version 4.16.19craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19Fix Suggestion:
Update to version 4.16.19craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23Fix Suggestion:
Update to version 5.8.23Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
POC
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
EPSS
Base Score:
0.01