denial-of-service news
3 stories
Dnsmasq DNSSEC Vulnerability Leads to Denial-of-Service
A critical denial-of-service vulnerability, identified as CVE-2026-4890, has been disclosed in Dnsmasq, a widely used DNS forwarder and DHCP server. The flaw, which received a CVSS score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), allows remote attackers to trigger an infinite loop by sending specially crafted DNSSEC NSEC/NSEC3 records, leading to a denial-of-service condition.
OpenSSL Vulnerability Allows Memory Exhaustion via 11-Byte Payload
A denial-of-service vulnerability, dubbed "HollowByte," has been discovered in OpenSSL that allows remote, unauthenticated attackers to exhaust server memory and trigger denial-of-service attacks using a specially crafted 11-byte payload. The flaw was disclosed by Okta's Red Team on July 18, 2026.
OpenSSL Flaw Allows Denial-of-Service via Small TLS Requests
A denial-of-service vulnerability has been identified in OpenSSL, allowing attackers to disrupt service by sending small TLS requests. The flaw, internally dubbed "HollowByte," can be triggered with an 11-byte TLS request, leading to significant memory allocation issues on vulnerable servers.