---
id: "CVE-2026-57203"
kind: "vulnerability"
aliases: ["CVE-2026-57203"]
title: "Asterisk: ast_loggrabber runs a script planted in world-writable /tmp"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["asterisk", "linux", "runtime", "self-hosted", "telephony"]
not_affected_if: ["ast_loggrabber-unused", "no-local-shell-users"]
published_at: "2026-10-27T22:17:27+00:00"
first_seen_at: "2026-10-27T22:29:29+00:00"
updated_at: "2026-10-27T22:30:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57203", "first_seen_at": "2026-10-27T22:29:29+00:00"}]
---

# Asterisk: ast_loggrabber runs a script planted in world-writable /tmp

The ast_loggrabber tool in Asterisk runs a Python script taken from the world-writable /tmp directory. A local user who already has a shell on the server can plant a malicious script there and gain elevated privileges when an administrator runs the tool.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Asterisk version with `asterisk -V` and compare it to the fixed releases listed below.
- Check whether `ast_loggrabber` is present and who runs it, for example with `which ast_loggrabber` and by reviewing sudo rules.

## Fix

- Upgrade Asterisk 20 to `20.20.1` or later, Asterisk 21 to `21.12.3` or later, Asterisk 22 to `22.10.1` or later, and Asterisk 23 to `23.4.1` or later.
- Upgrade Certified Asterisk 20.7 to `20.7-cert11` or later and Certified Asterisk 22.8 to `22.8-cert3` or later.

## Timeline

- 2026-10-27T22:29:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-57203

## From the sources

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, `ast_loggrabber` executes a `Python script` from the world-writable `/tmp` directory. An attacker already authorized to open a shell session on the Asterisk server may place a malicious script there and gain elevated privileges or execute code when an administrator runs `ast_loggrabber` as a user with elevated privileges. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_