CVE-2026-56692

NanoClaw < 2.1.17 - Arbitrary File Read via Symlink Following in forwardAttachedFiles

Published Jun 23, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

Description

NanoClaw before 2.1.17 contains a symlink following vulnerability in forwardAttachedFiles that allows container-controlled agents to exfiltrate host-readable files. The host validates attachment filenames using only isSafeAttachmentName before copying with fs.copyFileSync, which follows symlinks without containment checks, allowing malicious agents to disclose arbitrary host files.

Analysis

Technical impact

NanoClaw before version 2.1.17 contains a symlink following vulnerability in its forwardAttachedFiles function. The host validates attachment names only with isSafeAttachmentName before copying with fs.copyFileSync, which follows symlinks without checking containment. This flaw allows an attacker controlling a container to read arbitrary files on the host machine, exposing sensitive data.

Affected Systems

The affected product is NanoClaw from NanocoAI. Versions prior to 2.1.17 are vulnerable; any system running these releases is at risk.

Risk and Exploitability

The CVSS score of 6.8 indicates a moderate severity vulnerability. EPSS data is not available, and the vulnerability is not listed in CISA’s KEV catalog. Based on the description, the likely attack vector involves a malicious or compromised container executing the forwardAttachedFiles function, which can lead to disclosure of arbitrary host files. The lack of containment checks during symlink resolution makes this attack trivial for an attacker who can supply a crafted attachment name.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

nanocoai

nanoclaw

unaffected

Version	Status	Constraints
`0`	affected	< 2.1.17
`2.1.17`	unaffected	—

No data.

Vendor Product Versions

Nanoco

Nanoclaw

Version	Status	Scheme	Platform
`[0,2.1.17)`	affected	semver	—
`2.1.17`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade NanoClaw to 2.1.17 or later to apply the fix for CWE-59, which removes the unchecked symlink following during file copying.
If upgrade is not possible, mitigate by disabling or restricting the forwardAttachedFiles function for untrusted or container-controlled agents, thereby limiting exploitation of the CWE-59 flaw.
Enforce stricter filesystem permissions, such as using read-only mounts or dedicated permission boundaries, to prevent a container from accessing host files that could be bound to the CWE-59 vulnerability.

Generated by OpenCVE AI on June 24, 2026 at 11:23 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.166% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/nanocoai/nanoclaw/commit/28032bc0eca76c91fb3d8be0013e8bcaf2f5aeae
https://github.com/nanocoai/nanoclaw/pull/2468
https://www.vulncheck.com/advisories/nanoclaw-arbitrary-file-read-via-symlink-following-in-forwardattachedfiles

History

Jul 14, 2026 9:45 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:nanoco:nanoclaw::::::::

Jun 24, 2026 4:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Nanoco Nanoco nanoclaw
Vendors & Products		Nanoco Nanoco nanoclaw

Jun 24, 2026 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jun 23, 2026 3:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		NanoClaw before 2.1.17 contains a symlink following vulnerability in forwardAttachedFiles that allows container-controlled agents to exfiltrate host-readable files. The host validates attachment filenames using only isSafeAttachmentName before copying with fs.copyFileSync, which follows symlinks without containment checks, allowing malicious agents to disclose arbitrary host files.
Title		NanoClaw < 2.1.17 - Arbitrary File Read via Symlink Following in forwardAttachedFiles
Weaknesses		CWE-59
References		https://github.com/nanocoai/nanoclaw/commit/28032bc0eca76c91fb3d8be0013e8bcaf2f5aeae https://github.com/nanocoai/nanoclaw/pull/2468 https://www.vulncheck.com/advisories/nanoclaw-arbitrary-file-read-via-symlink-following-in-forwardattachedfiles
Metrics		cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}` cvssV4_0 `{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`