Severe Twig Vulnerability Allows Arbitrary Code Execution in Ubuntu 26.04 LTS
Severity: High (Score: 72.0)
Sources: Linuxsecurity, Ubuntu
Published: · Updated:
Keywords: twig, ubuntu, made, programs, received, specially, crafted
Severity indicators: severe, flaw, arbitrary code execution
Summary
A critical vulnerability in the Twig template engine affects Ubuntu 26.04 LTS and its derivatives. Discovered on June 8, 2026, the flaw allows an authenticated user to execute arbitrary code by sending specially crafted network traffic. The issue arises from improper validation of PHP callables in Twig when using a source policy. Users are advised to update to php-twig version 3.23.0-2ubuntu0.1~esm1 to mitigate the risk. This vulnerability poses a significant threat to systems running affected versions of Ubuntu. A standard system update will also apply the necessary changes. Ubuntu Pro users benefit from extended security coverage for this issue. The vulnerability is tracked under USN-8408-1. Key Points: • Twig vulnerability allows arbitrary code execution via crafted network traffic. • Affected systems include Ubuntu 26.04 LTS and its derivatives. • Users should update to php-twig version 3.23.0-2ubuntu0.1~esm1 to mitigate risks.
Detailed Analysis
**Impact** The vulnerability affects Ubuntu 26.04 LTS and its derivatives, specifically the php-twig package used in PHP environments. Authenticated users could exploit this flaw to execute arbitrary code, potentially compromising systems running vulnerable versions. The issue impacts organizations using Ubuntu 26.04 LTS globally, including sectors relying on PHP-based web applications, with no specific data breach details reported. **Technical Details** The attack vector involves specially crafted network traffic sent by an authenticated user targeting the php-twig template engine. The vulnerability arises from improper validation of PHP callables when using a source policy, enabling arbitrary code execution. No CVE identifier or malware/tool names were provided. The kill chain stage corresponds to execution following successful authentication. No IOCs or infrastructure details were disclosed. **Recommended Response** Apply the updated php-twig package version 3.23.0-2ubuntu0.1~esm1 available for Ubuntu 26.04 LTS via standard system updates or Ubuntu Pro. Prioritize patching systems to prevent exploitation. Monitor for unusual authenticated network activity targeting php-twig services. No additional detection signatures or configuration changes were specified.
Source articles (2)
- USN-8408-1: Twig vulnerability — Ubuntu · 2026-06-08
Twig could be made to run programs if it received specially crafted network traffic from an authenticated user. It was discovered that Twig did not properly validate PHP callables when using a source… - Ubuntu 26.04 LTS php-twig Severe Arbitrary Code Execution Flaw USN-8408 — Linuxsecurity · 2026-06-09
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS Summary: Twig could be made to run programs if it received specially crafted network traffic from an authentic…
Timeline
- 2026-06-08 — Twig vulnerability discovered: The vulnerability allows authenticated users to execute arbitrary code due to improper validation of PHP callables.
- 2026-06-09 — Security advisory published: Linuxsecurity reports on the Twig vulnerability, urging users to update their systems to prevent exploitation.
Related entities
- Zero-day Exploit (Attack Type)
- CWE-94 - Code Injection (Cwe)
- T1203 - Exploitation for Client Execution (Mitre Attack)
- Php-twig (Platform)
- Twig (Platform)
- Ubuntu (Company)
- Twig Vulnerability (Vulnerability)