Resource exhaustion in Discourse - CVE-2023-41043
Published: September 13, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136089
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-41043
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in SvgSprite cache when bundling and caching theme component icon sprite uploads. A remote user can create a theme with a large number of theme components containing large icons-sprite uploads to cause a denial of service.
This issue only affects multisite installations.
Affected software
Discourse
How to mitigate CVE-2023-41043
Install security update from vendor's website.
Discourse - addressed in versions 3.1.1, 3.2.0 beta1