SB2026110942 - Multiple vulnerabilities in Sofia-SIP
Published: November 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Infinite loop (CVE-ID: CVE-2026-116792)
CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an unauthenticated remote attacker to cause persistent denial of service by stalling subsequent SIP URI resolution in Sofia-SIP.
The vulnerability exists due to missing traversal limits in the bundled DNS resolver when an accepted response contains cyclic domain name compression pointers. An unauthenticated remote attacker can send a SIP request naming a domain whose authoritative nameserver they control and return a crafted DNS response, trapping the decoding thread until the process restarts.
2) Heap-based buffer overflow (CVE-ID: CVE-2026-116791)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an unauthenticated remote attacker to corrupt heap memory and crash the hosting process, disrupting all concurrent sessions.
The vulnerability exists due to Sofia-SIP's WebSocket parser counting header bytes when unmasking a payload buffer filled to capacity, causing writes beyond its allocation. An unauthenticated remote attacker can send a crafted masked frame through an enabled ws-binding or wss-binding after a WebSocket upgrade, without SIP authentication or victim interaction.
Remediation
Install update from vendor's website.