CVE-2026-90778: Sipp

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

SIPp through 3.7.7 contains a buffer overflow vulnerability in get_peer_tag() function when processing SIP To headers with tag parameters of 2049 bytes or more. Unauthenticated remote attackers can send crafted SIP messages with oversized tag parameters to overflow the static buffer and crash the process.

Affected products

• Sipp Sipp: up to and including 3.7.7

Published 2026-09-13. Last modified 2026-09-23.