CVE-2026-49140: Allocation of Resources Without Limits or Throttling in HKUDS nanobot
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.
AI Analysis
Technical Summary
CVE-2026-49140 describes a denial of service vulnerability in HKUDS nanobot before version 0.2.1. The flaw exists in the Matrix channel media download handler, where authenticated users can send media events lacking or having invalid size metadata. This triggers multiple concurrent large media downloads that consume process memory and bandwidth fully before the system rejects them post-download. The absence of limits or throttling on resource allocation allows attackers to exhaust system resources, resulting in service degradation.
Potential Impact
Exploitation allows authenticated room members to cause denial of service by exhausting process memory and bandwidth through crafted media events. This can degrade or disrupt the availability of the nanobot service handling Matrix media downloads.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented at this time.
CVE-2026-49140: Allocation of Resources Without Limits or Throttling in HKUDS nanobot
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.
CVSS v4.0
Score 5.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49140 describes a denial of service vulnerability in HKUDS nanobot before version 0.2.1. The flaw exists in the Matrix channel media download handler, where authenticated users can send media events lacking or having invalid size metadata. This triggers multiple concurrent large media downloads that consume process memory and bandwidth fully before the system rejects them post-download. The absence of limits or throttling on resource allocation allows attackers to exhaust system resources, resulting in service degradation.
Potential Impact
Exploitation allows authenticated room members to cause denial of service by exhausting process memory and bandwidth through crafted media events. This can degrade or disrupt the availability of the nanobot service handling Matrix media downloads.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-27T17:40:12.739Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1de934e29bf47b503e8492
Added to database: 06/01/2026, 20:19:00 UTC
Last enriched: 07/30/2026, 00:45:28 UTC
Last updated: 07/31/2026, 21:26:47 UTC
Views: 100
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