Advisories

Coordinated-disclosure advisories and technical writeups. Each post goes live only after the vendor has been notified and, where applicable, a patch and/or CVE is public.

One UDP Packet to Freeze an iperf3 Server: CVE-2026-102253

A single crafted parameter message and one 16-byte UDP datagram pin an iperf3 server’s receive thread at 100% CPU forever — unauthenticated, no valid test session. Fixed in iperf3 3.22.

From a Stray Apostrophe to Root: Escalating a Standard HestiaCP Account to Full Server Compromise

A single quote in a directory name lets any standard HestiaCP user account escalate to root. Reported, confirmed, and fixed in HestiaCP 1.10.5. GHSA-r9q4-pmcm-5qqf, CVSS 9.9.