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GHSA-4g5x-2jfc-xm98

GHSA-4g5x-2jfc-xm98: OpenClaw: Tlon media downloads can bypass core safety limits and exhaust disk

Summary

Tlon media downloads can bypass core safety limits and exhaust disk

Current Maintainer Triage

Status: narrow
Normalized severity: low
Assessment: Shipped v2026.3.28 Tlon media downloads bypassed core size/count/cleanup limits, but this is availability-only resource exhaustion in a bundled plugin path, so low.

Affected Packages / Versions

Package: openclaw (npm)
Latest published npm version: 2026.3.31
Vulnerable version range: <=2026.3.28
Patched versions: >= 2026.3.31
First stable tag containing the fix: v2026.3.31

Fix Commit(s)

2194587d70d2aef863508b945319c5a7c88b12ce — 2026-03-31T19:40:15+09:00

Release Process Note

The fix is already present in released version 2026.3.31.
This draft looks ready for final maintainer disposition or publication, not additional code-fix work.

Thanks @AntAISecurityLab for reporting.

(GitHub Advisory)

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GHSA-4g5x-2jfc-xm98

GHSA-4g5x-2jfc-xm98:

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
openclaw	npm	<= 2026.3.28	2026.3.31

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the openclaw package's handling of media downloads from Tlon. The analysis of the provided patch commit 2194587d70d2aef863508b945319c5a7c88b12ce reveals two key functions involved in the vulnerability. The primary vulnerable function is downloadMedia in extensions/tlon/src/monitor/media.ts. Before the patch, this function would download a file from a provided URL and save it to disk without enforcing any size limits. This allowed a remote attacker to trigger the download of an arbitrarily large file, leading to disk space exhaustion and a denial of service. The patch addresses this by replacing the direct file streaming with a call to fetchRemoteMedia, which enforces a size limit (MAX_IMAGE_BYTES).

A secondary function, extractImageBlocks in the same file, contributed to the issue. This function extracts image URLs from messages. Prior to the fix, it did not limit the number of URLs it would extract. This allowed an attacker to amplify the attack by including many image URLs in a single message. The patch adds a limit to the number of images that can be processed per message, acting as a secondary defense mechanism. Therefore, both downloadMedia and extractImageBlocks would appear in a runtime profile during the exploitation of this vulnerability.

Vulnerable functions

downloadMedia

extensions/tlon/src/monitor/media.ts

The `downloadMedia` function was vulnerable to disk exhaustion because it downloaded files from an external URL and wrote them to the disk without any size validation. An attacker could provide a URL to a very large file, causing the server to download it and fill up the available disk space. The patch fixes this by using `fetchRemoteMedia` with a `maxBytes` limit, which prevents excessively large files from being downloaded.

extractImageBlocks

extensions/tlon/src/monitor/media.ts

The `extractImageBlocks` function was involved in the vulnerability by extracting all image URLs from a message without any limit. An attacker could craft a message with a large number of image URLs, each of which would then be downloaded by the vulnerable `downloadMedia` function. The patch mitigates this by introducing a limit (`MAX_IMAGES_PER_MESSAGE`) on the number of images that can be extracted from a single message.

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WAF Rule

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Reasoning

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