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

Quick assessment

Affected
HKUDS nanobot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nanobot是Data Intelligence Lab@HKU开源的一个轻量个人AI助手。 Nanobot 0.2.1之前版本存在安全漏洞，该漏洞源于Matrix频道媒体下载处理程序中拒绝服务问题，可能导致经过身份验证的room成员通过发送缺少或无效大小元数据的媒体事件，耗尽进程内存和带宽。

CVSS 4.3 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
HKUDS nanobot < 0.2.1 affected
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I. Basic Information for CVE-2026-49140

Vulnerability Information
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Vulnerability Title
Nanobot < 0.2.1 Denial of Service via Matrix Media Download Handler
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
nanobot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nanobot是Data Intelligence Lab@HKU开源的一个轻量个人AI助手。 Nanobot 0.2.1之前版本存在安全漏洞，该漏洞源于Matrix频道媒体下载处理程序中拒绝服务问题，可能导致经过身份验证的room成员通过发送缺少或无效大小元数据的媒体事件，耗尽进程内存和带宽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HKUDS nanobot 0 ~ 0.2.1 -

II. Public POCs for CVE-2026-49140

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III. Intelligence Information for CVE-2026-49140

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Patches & Fixes for CVE-2026-49140 (2)

Proof of Concept for CVE-2026-49140 (1)

Other References for CVE-2026-49140 (1)

Same Patch Batch · HKUDS · 2026-06-01 · 3 CVEs total

CVE-2026-49139 7.0 HIGH Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning
CVE-2026-49138 5.0 MEDIUM Nanobot < 0.2.1 SSRF via web_fetch Tool Redirect Following

IV. Related Vulnerabilities

Same product: nanobot
Same vendor: HKUDS
Same weakness: CWE-770