Heap-based buffer overflow in hyperscan - CVE-2026-63540
Published: November 13, 2026
Vulnerability identifier: #VU166189
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63540
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error. A local attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and cause a denial of service condition on the target system.
Affected software
hyperscan
How to mitigate CVE-2026-63540
Install updates from vendor's website.
hyperscan - update to 5.4.2.1