Quick answers
- Is CVE-2026-90809 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90809 being exploited in the wild.
- How severe is CVE-2026-90809?
- High severity, with a CVSS score of 7.3, published 14 September 2026.
- Which products and versions are affected?
- HKUDS Nanobot up to 0.2.1.
- Is there a fix for CVE-2026-90809?
- A patch was published on 2026-09-14: Patch af582246f141311d574551b7571a517bcc3df750 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-90809 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-90809?
- Check whether you run HKUDS Nanobot 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
An argument injection vulnerability exists in the ExecTool._guard_command and ExecTool._spawn functions within nanobot/agent/tools/shell.py. The vulnerability allows attackers to craft malicious input that bypasses the exec.allowPatterns security filter, enabling shell-chain attacks that execute unintended commands. The attack is network-accessible and does not require authentication. An attacker can exploit this to execute arbitrary shell commands with the privileges of the nanobot process. A fix is available in patch af582246f141311d574551b7571a517bcc3df750 and should be applied to versions 0.2.1 and earlier.
Affected products
- HKUDS nanobot up to 0.2.1
Timeline
- 2026-09-14: disclosed
- 2026-09-14: patched: Patch af582246f141311d574551b7571a517bcc3df750