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CVE-2026-44545— Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service

Quick assessment

Affected
djangoproject daphne
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.

daphne是Django开源的一个支持HTTP、HTTP2和WebSocket的ASGI协议服务器。 daphne 4.2.2之前版本存在安全漏洞，该漏洞源于未传递最大帧或消息有效载荷大小，可能导致未经身份验证的远程攻击者发送任意大的WebSocket消息，造成过度内存消耗和拒绝服务。

CVSS 5.3 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
djangoproject daphne 4.2.0≤ 4.2.1 affected
4.2.2 unaffected
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I. Basic Information for CVE-2026-44545

Vulnerability Information
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Vulnerability Title
Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
daphne 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
daphne是Django开源的一个支持HTTP、HTTP2和WebSocket的ASGI协议服务器。 daphne 4.2.2之前版本存在安全漏洞，该漏洞源于未传递最大帧或消息有效载荷大小，可能导致未经身份验证的远程攻击者发送任意大的WebSocket消息，造成过度内存消耗和拒绝服务。
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
djangoproject daphne 4.2.0 ~ 4.2.1 -

II. Public POCs for CVE-2026-44545

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III. Intelligence Information for CVE-2026-44545

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Same Patch Batch · djangoproject · 2026-06-03 · 7 CVEs total

CVE-2026-44546 3.7 LOW Header injection via WebSocket upgrade parser differential allows ASGI scope header spoofi
CVE-2026-7666 3.1 LOW Potential unencrypted email transmission via STARTTLS in the SMTP backend
CVE-2026-48587 3.1 LOW Potential exposure of private data via whitespace padding in Vary header
CVE-2026-35193 3.1 LOW Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddlewar
CVE-2026-6873 3.1 LOW Signed cookie salt namespace collision in django.http.HttpRequest.get_signed_cookie
CVE-2026-8404 3.1 LOW Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCa

IV. Related Vulnerabilities

Same product: daphne
Same vendor: djangoproject
Same weakness: CWE-770

V. Comments for CVE-2026-44545

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