CVE-2026-40424 · Package
NO FIX YET · SEE WHAT TO DO
Hyperscan, Intel's regular expression matching library, has an out-of-bounds read in versions before v5.4.2.1 that can crash the application using it. A local unprivileged user-space program can trigger a denial of service without user interaction.
first public Nov 10, 2026 · 1 source
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Applications that embed Hyperscan for pattern matching and run it in user space on the same machine as untrusted local processes. Services that only run Hyperscan on trusted inputs in isolated environments are lower risk. The sources do not describe a specific default configuration.
Not affected if hyperscan-at-or-above-5.4.2.1, hyperscan-not-used
Who cares c++, hyperscan, local-services
pkg-config --modversion libhs or the version in your vendored copy5.4.2.1 or laterOut-of-bounds read for some Hyperscan before version v5.4.2.1 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an unauthenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (none) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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