Is CVE-2026-90691 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-90691 being exploited in the wild.

How severe is CVE-2026-90691?

High severity, with a CVSS score of 8.3, published 14 September 2026.

Which products and versions are affected?

0x4m4 HexStrike AI up to d689933ff579d839c676c82b231f8e98326c5f04.

Is there a fix for CVE-2026-90691?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-90691 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-90691?

Check whether you run 0x4m4 HexStrike AI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-90691: 0x4m4 HexStrike AI path traversal in file operations

CVE-2026-90691 · Severity: high · CVSS 8.3 · Published 2026-09-14

HexStrike AI is an AI-powered security analysis tool with a file handling API endpoint. A path traversal vulnerability in the file operations functionality allows remote attackers to write arbitrary files outside the intended sandbox directory, potentially enabling remote code execution by injecting malicious scripts (e.g., web shells) into system-accessible locations.

Technologies: 0x4m4 HexStrike AI. Vendors: 0x4m4.

Quick answers

Is CVE-2026-90691 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-90691 being exploited in the wild.
How severe is CVE-2026-90691?: High severity, with a CVSS score of 8.3, published 14 September 2026.
Which products and versions are affected?: 0x4m4 HexStrike AI up to d689933ff579d839c676c82b231f8e98326c5f04.
Is there a fix for CVE-2026-90691?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-90691 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-90691?: Check whether you run 0x4m4 HexStrike AI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a path traversal (CWE-22) in the FileOperationsManager component of hexstrike_server.py, specifically in the API Files Endpoint. The vulnerable code fails to validate the filename parameter before combining it with a base directory, allowing attackers to use sequences like "../../../" to escape the sandbox. The vulnerability affects file creation and modification endpoints (/api/files/create and /api/files/modify). An unauthenticated remote attacker can exploit this to write arbitrary files to any location on the system (e.g., /var/www/html/shell.php for RCE or SSH keys for account takeover). The issue has been publicly disclosed but no patch has been released as the project maintainers have not responded.

Affected products

0x4m4 HexStrike AI up to d689933ff579d839c676c82b231f8e98326c5f04

Timeline

2026-01-18: disclosed: Security issue reported via GitHub issue #135
2026-09-14: disclosed: CVE-2026-90691 published
2026-09-14: other: Public disclosure; project has not responded to maintainers

References

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