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GuardFall Flaw Hits 10 of 11 Popular Open

Securityaffairs.Co •Pierluigi Paganini • July 1, 2026

Researchers found a shell injection flaw in 10 of 11 popular open-source AI agents, allowing attackers to bypass command filters. Adversa AI just published a survey, titled “GuardFall: a universal shell injection vulnerability in open-source AI agents,” of eleven open-source AI coding and computer-use agents, and the headline finding is uncomfortable: ten of them leave […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

GuardFall Vulnerability Exposes Open-Source AI Agents to Shell Injection Attacks A survey by Adversa AI revealed a critical shell injection vulnerability, named GuardFall, in 10 out of 11 popular open-source AI agents. This flaw allows attackers to bypass command filters, potentially leading to unauthorized command execution and access to sensitive data like SSH keys and cloud credentials. The vulnerability arises from a mismatch in how security filters and the Bash shell interpret commands. Attackers can exploit this by using techniques such as quote removal and command substitutions. Only one agent, Continue, effectively mitigated the risk by employing a multi-component evaluation process. The affected agents include widely used tools like Hermes and Roo-code, which run with full developer privileges, increasing the risk of supply chain attacks. The findings underscore a significant security gap in open-source AI tools, necessitating urgent remediation efforts. 5 sources 68

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GuardFall Flaw Hits 10 of 11 Popular Open

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Extracted Entities

CWE Weaknesses (1)

MITRE ATT&CK (1)

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