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Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

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

High 7.1

In plain English

A high-severity integer overflow in pupnp from pupnp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.3%top 73.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13pupnpno fix listedDEBIAN-CVE-2026-57488
Debian:14pupnp1:22.1.8-2DEBIAN-CVE-2026-57488
Ubuntu:24.04:LTSpupnpno fix listedUBUNTU-CVE-2026-57488
Ubuntu:26.04:LTSpupnpno fix listedUBUNTU-CVE-2026-57488
Ubuntu:26.10pupnpno fix listedUBUNTU-CVE-2026-57488
Ubuntu:22.04:LTSpupnp-1.8no fix listedUBUNTU-CVE-2026-57488

Affected products (as reported)

VendorProductVersions
pupnp pupnp < 2.0.2

Weakness: CWE-190, CWE-444 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

References