CVE-2026-5772
MatchDomainName 1-Byte Stack Buffer Over-Read in Hostname Validation
Summary
MatchDomainName 1-Byte Stack Buffer Over-Read in Hostname Validation
Original description
The description as published by the source.
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.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-5772 wolfssl
- Ubuntu UBUNTU-CVE-2026-5772 wolfssl
References
- advisory github.com
- advisory nvd.nist.gov
- patch github.com