Stack-based Buffer Overflow Affecting asterisk package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.53% (43rd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-ASTERISK-19638010
  • published6 Sept 2026
  • disclosed4 Sept 2026

Introduced: 4 Sep 2026

CVE-2026-57166  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable asterisk.

NVD Description

Note: Versions mentioned in the description apply only to the upstream asterisk package and not the asterisk package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

PJSIP is a free and open source multimedia communication library written in C. Prior to commit 4472a31, a stack buffer overflow exists in the PJLIB-UTIL telnet CLI front-end when rendering feedback for an entered command line. Several command-line handling paths write an attacker-influenced amount of data into fixed-size buffers without sufficient bounds checking, so a long command line can overflow them. This affects only applications that enable the telnet CLI front-end (e.g. pj_cli_telnet_create() / --cli-telnet-port). The telnet CLI is an interactive administration interface with no authentication, so any client able to reach it can already issue arbitrary CLI commands. A malformed or overly long command line can overflow a fixed-size stack buffer while rendering command-line feedback, which may lead to application termination. Because reaching this code already requires access to the unauthenticated CLI, the impact beyond that existing access is limited. Applications that do not enable the telnet CLI front-end are not affected. This issue has been patched via commit 4472a31.

CVSS Base Scores

version 3.1