EUVD-2026-21218
GHSA-6v2v-jgg9-h79w
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/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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3Tags
Description
A 1-byte stack buffer over-read was identified in the MatchDomainName function (src/internal.c) during wildcard hostname validation when the LEFT_MOST_WILDCARD_ONLY flag is active. If a wildcard * exhausts the entire hostname string, the function reads one byte past the buffer without a bounds check, which could cause a crash.
Analysis
Stack buffer over-read in wolfSSL's MatchDomainName function allows authenticated remote attackers to cause denial of service through a crafted wildcard hostname during TLS certificate validation when the LEFT_MOST_WILDCARD_ONLY flag is enabled. The vulnerability reads one byte past the allocated buffer when a wildcard character exhausts the entire hostname string, triggering a potential crash with very low real-world exploitation probability (EPSS and CVSS indicate limited practical risk).
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