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CVE-2026-77630— pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing

Quick assessment

Affected
pupnp pupnp
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.

pupnp 是一个用于开发 UPnP 设备和控制点应用程序的软件开发工具包（SDK）。在 22.0.4 版本之前， 中的 函数会在 中的 处理来自入站 HTTP 请求目标的攻击者提供的主机名，以及在 中由 处理的 GENA SUBSCRIBE 回调头信息时，同步调用 。远程未认证的攻击者可以选择一个响应缓慢或无响应的主机名，从而在解析器超时期间阻塞有限数量的迷你服务器工作线程，使得少量请求即可耗尽线程池，导致 UPnP 服务拒绝服务。该问题已在 22.0.4 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
pupnp pupnp < 22.0.4 affected
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I. Basic Information for CVE-2026-77630

Vulnerability Information
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Vulnerability Title
pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing
Source: CVE Program / CVE List V5
Vulnerability Description
pupnp is an SDK for development of UPnP device and control point applications. Prior to 22.0.4, parse_hostport in upnp/src/genlib/net/uri/uri.c synchronously calls getaddrinfo while parse_uri is processing attacker-supplied hostnames from inbound HTTP request targets in upnp/src/genlib/net/http/httpparser.c and GENA SUBSCRIBE CALLBACK headers handled by create_url_list in upnp/src/gena/gena_device.c. A remote unauthenticated peer can choose a slow or nonresponsive hostname and block a bounded miniserver worker for the resolver timeout, allowing a small number of requests to exhaust the thread pool and deny UPnP service. This issue is fixed in 22.0.4.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pupnp pupnp < 22.0.4 -

II. Public POCs for CVE-2026-77630

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III. Intelligence Information for CVE-2026-77630

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Patches & Fixes for CVE-2026-77630 (1)

Vendor Pages for CVE-2026-77630 (1)

Other References for CVE-2026-77630 (1)

Same Patch Batch · pupnp · 2026-10-16 · 5 CVEs total

CVE-2026-57487 7.5 HIGH libupnp chunked HTTP bodies can bypass g_maxContentLength and be fully buffered
CVE-2026-57486 7.5 HIGH pupnp: NULL pointer dereference in ixmlNode_compare crashes on non-namespaced attributes
CVE-2026-57488 7.1 HIGH pupnp: Integer truncation in HTTP Content-Length parsing enables request smuggling
CVE-2026-55862 6.5 MEDIUM pupnp: Incomplete fix for CVE-2021-28302: recursive DOM functions cause stack overflow

IV. Related Vulnerabilities

Same product: pupnp
Same vendor: pupnp
Same weakness: CWE-400

V. Comments for CVE-2026-77630

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