Stack-based buffer overflow in pjsip - #VU165885
Published: November 11, 2026
Vulnerability identifier: #VU165885
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: N/A
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and potentially corrupt memory in applications enabling the telnet CLI.
The vulnerability exists due to stack-based buffer overflows from unchecked string operations and an assertion failure in the pjlib-util CLI when constructing command keys, prompts, or hints and handling excessive completion candidates. A remote attacker can press TAB on a command exceeding the hint limit to abort assertion-enabled builds, or trigger buffer overflows under non-default command trees or application-supplied configuration to corrupt memory.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18