CVE-2026-49140Public exploitNetwork attack vector

Denial of service via unbounded Matrix media downloads

Published Jun 1, 2026 · Updated Jun 1, 2026

Denial of service in Data Intelligence Lab @ HKU nanobot before 0.2.1 allows remote authenticated users to exhaust memory via Matrix media. The Matrix channel accepts missing or invalid content.info.size values, materializes whole response bodies before rejecting them, and permits concurrent downloads. Reachability requires Matrix to be enabled and an admitted room member to send media; repeated events degrade the bot process without reported data disclosure or modification.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Data Intelligence Lab @ HKU nanobot before 0.2.1 allows remote authenticated users to exhaust memory via Matrix media. The Matrix channel accepts missing or invalid content.info.size values, materializes whole response bodies before rejecting them, and permits concurrent downloads. Reachability requires Matrix to be enabled and an admitted room member to send media; repeated events degrade the bot process without reported data disclosure or modification.

The record

CVE
CVE-2026-49140
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Data Intelligence Lab @ HKU
Product
nanobot
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Data Intelligence Lab @ HKU · nanobotversion=0 <0.2.1

Published CVSS scores

5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
4.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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