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.
History

Tue, 02 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 01 Jun 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Hkuds
Hkuds nanobot
Vendors & Products Hkuds
Hkuds nanobot

Mon, 01 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Nanobot < 0.2.1 Denial of Service via Matrix Media Download Handler
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-06-02T12:34:55.972Z

Reserved: 2026-05-27T17:40:12.739Z

Link: CVE-2026-49140

cve-icon Vulnrichment

Updated: 2026-06-02T12:34:39.891Z

cve-icon NVD

Status : Deferred

Published: 2026-06-01T21:16:47.070

Modified: 2026-06-02T14:43:49.920

Link: CVE-2026-49140

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-01T21:30:26Z