OpenSSL HollowByte Flaw: DoS via 11-Byte TLS Request
🟠 High | Source: The Hacker News A flaw in OpenSSL, dubbed HollowByte by Okta’s Red Team, allows an attacker to send an 11-byte TLS request that tricks an unpatched server into reserving up to 131 KB of memory for a message that never arrives. On Linux systems using glibc, that memory is not released until the process restarts, making repeated requests a viable denial-of-service attack. OpenSSL quietly shipped a fix in June 2025 with no CVE, no security advisory, and no changelog reference. ...