NousResearch Hermes Agent up to 0.21.0 Git Status Index Refresh .git/config core.fsmonitor os command injection

Summaryinfo

A vulnerability was found in NousResearch Hermes Agent up to 0.21.0 and classified as critical. Impacted is an unknown function of the file .git/config of the component Git Status Index Refresh. Executing a manipulation of the argument core.fsmonitor can lead to os command injection. This vulnerability appears as CVE-2026-71963. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in NousResearch Hermes Agent up to 0.21.0. This vulnerability affects an unknown code of the file .git/config of the component Git Status Index Refresh. The manipulation of the argument core.fsmonitor with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Hermes Agent 0.18.2 through 0.21.0, fixed in commit f6234d0, contains a remote code execution vulnerability that allows attackers to execute arbitrary OS commands by supplying a malicious repository with a crafted .git/config that sets core.fsmonitor to an attacker-controlled command. When a user opens the malicious repository and sends any message, the agent triggers a git status index refresh which executes the injected command in the user's process context, exposing the full environment including configured provider API keys.

The advisory is available at manifold.security. This vulnerability was named CVE-2026-71963 since 08/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Applying the patch f6234d00c5d59450adea1d7edd30ad3859375c79 is able to eliminate this problem.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• NousResearch

Name

• Hermes Agent

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion