CVE-2026-49140

Medium

Description

Nanobot prior to version 0.2.1 contains a denial of service vulnerability in the Matrix channel media download handler that allows authenticated room members to exhaust process memory and bandwidth by sending media events with missing or invalid size metadata. Attackers can send multiple concurrent Matrix media events with omitted or invalid declared sizes to trigger simultaneous large media downloads that fully materialize response bodies before post-download rejection, consuming process resources until service degradation occurs.

SeverityMedium

CVSS4.3

Exploit probability—

ProductHkuds Nanobot

PublishedJun 1, 2026

First seenJun 1, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

HKUDS nanobot0.2.1 or later

Patches

github.com/HKUDS/nanobot/commit/1d4000560dfff1acb83f5c5ca8ef3ab1f092bd14

Vendor advisories

github.com/HKUDS/nanobot/releases/tag/v0.2.1

Affected products

Product	Affected versions	Fixed in
HKUDS nanobot	v < 0.2.1	0.2.1

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.