CVE-2026-49140Nanobot < 0.2.1 Denial of Service via Matrix Media Download Handler

Beschreibung

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.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• nanobot 0.2.1 Release Notes release-notes
• https://github.com/HKUDS/nanobot/pull/4106 issue-trackingpatch
• https://github.com/HKUDS/nanobot/commit/1d4000560dfff1acb83f5c5ca8ef3ab1f092bd14 patch
• https://www.vulncheck.com/advisories/nanobot-denial-of-service-via-matrix-media-download-handler third-party-advisory