CVE-2026-49140— Nanobot < 0.2.1 Denial of Service via Matrix Media Download Handler
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-49140
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-49138 | 5.0 MEDIUM | Nanobot < 0.2.1 SSRF via web_fetch Tool Redirect Following |
| CVE-2026-49139 | Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning |
IV. Related Vulnerabilities
Same product: nanobot
- CVE-2026-49139
Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl - CVE-2026-49138
Nanobot < 0.2.1 SSRF via web_fetch Tool Redirect Following - CVE-2026-35589
nanobot: Cross-Site WebSocket Hijacking in WhatsApp Bridge ( - CVE-2026-33654
Zero-Click Indirect Prompt Injection and Authentication Bypa - CVE-2026-2577
Nanobot Unauthenticated WhatsApp Session Hijack via WebSocke
Same vendor: HKUDS
- CVE-2026-49139
Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl - CVE-2026-49138
Nanobot < 0.2.1 SSRF via web_fetch Tool Redirect Following - CVE-2026-32847
DeepCode 1.2.0 Path Traversal via SPA Catch-All Route in mai - CVE-2026-7551
HKUDS OpenHarness Remote Command Execution via /bridge Slash - CVE-2026-6823
HKUDS OpenHarness Insecure Default Remote Channel Allowlist
Same weakness: CWE-770
- CVE-2026-40990
Unbounded cache for function definitions - CVE-2026-10533
Openshift: openshift: non-admin user can bypass resourcequot - CVE-2026-49361
Apache Fluss Netty Frame Decoder Memory Exhaustion Vulnerabi - CVE-2026-45023
AutoGP: Credit system bypassed via direct block execution in - CVE-2026-45292
opentelemetry-java: Unbounded Memory Allocation in W3C Bagga
V. Comments for CVE-2026-49140
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