Inefficient Algorithmic Complexity in hono - CVE-2026-71848
Published: August 3, 2026 / Updated: August 8, 2026
Vulnerability identifier: #VU140824
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-71848
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to algorithmic complexity in languageDetector middleware when processing crafted language tags with a large number of hyphen-separated subtags. A remote attacker can send a specially crafted request to cause a denial of service.
Language values may be sourced from a query parameter, cookie, Accept-Language header, or URL path depending on configuration, and the default detector order exposes query-string, cookie, and header-based processing.
Affected software
hono
IBM App Connect Enterprise
Informix Dynamic Server
IBM App Connect Enterprise
Informix Dynamic Server
How to mitigate CVE-2026-71848
Install security update from vendor's website.
hono - update to 4.12.34
IBM App Connect Enterprise - update to 13.0.8.2
Informix Dynamic Server - addressed in versions 14.10.FC14W1, 15.0.1.16
IBM App Connect Enterprise - update to 13.0.8.2
Informix Dynamic Server - addressed in versions 14.10.FC14W1, 15.0.1.16