Resource exhaustion in Corteza - #VU164415
Published: November 10, 2026
Vulnerability identifier: #VU164415
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to exhaust server CPU resources and cause a denial of service.
The vulnerability exists due to unbounded quadratic-time parsing in Corteza Server's resolveAcceptLanguageHeaders function when processing Accept-Language headers or lng query parameters before authentication. A remote attacker can send concurrent requests containing long underscore-separated values that bypass the parser's hyphen-count guard because underscores are normalized after validation, saturating CPU cores and making the service unavailable.
Affected software
Corteza
Remediation
Install security update from vendor's website.
Corteza - update to 2026.9.0