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CVE-2026-57488— pupnp: Integer truncation in HTTP Content-Length parsing enables request smuggling

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包（SDK）。在 2.0.2 版本之前，位于 文件中的 函数使用 解析 字段，并将返回的 类型值转换为 32 位 ，随后调用者将其存储为 。在 LP64 数据模型的系统上，大于 的数值会被截断或发生回绕，导致 HTTP 解析器接受的实际请求体长度与声明值不一致。同一局域网内的远程对等方可利用此解析器不一致性，在持久连接或代理场景下，使部分字节被误解析为另一个请求；或者迫使工作线程等待一个极大的请求体，从而引发拒绝服务（DoS）攻击。该问题已在 2.

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
pupnp pupnp < 2.0.2 affected
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I. Basic Information for CVE-2026-57488

Vulnerability Information
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Vulnerability Title
pupnp: Integer truncation in HTTP Content-Length parsing enables request smuggling
Source: CVE Program / CVE List V5
Vulnerability Description
pupnp is an SDK for development of UPnP device and control point applications. Prior to 2.0.2, raw_to_int in upnp/src/genlib/net/http/httpparser.c parses Content-Length with strtol and casts the resulting long to a 32-bit int before the caller stores it as unsigned int. On LP64 systems, values greater than INT_MAX can truncate or wrap, so the HTTP parser can accept a body length different from the declared value. A remote adjacent-network peer can use the resulting parser disagreement to leave bytes to be interpreted as another request in persistent or proxied contexts, or can make a worker wait for an extremely large body and cause denial of service. This issue is fixed in 2.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pupnp pupnp < 2.0.2 -

II. Public POCs for CVE-2026-57488

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III. Intelligence Information for CVE-2026-57488

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Patches & Fixes for CVE-2026-57488 (1)

Vendor Advisories for CVE-2026-57488 (1)

Vendor Pages for CVE-2026-57488 (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-2026-77630 7.5 HIGH pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing
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-190

V. Comments for CVE-2026-57488

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