CVE-2026-57488 pupnp: Integer truncation in HTTP Content-Length parsing enables request smuggling
Integer truncation in HTTP Content-Length parsing allows request smuggling or denial of service in UPnP applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57488?
CVE-2026-57488 is a high-severity vulnerability in pupnp, published on 16 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Which versions are affected by CVE-2026-57488?
It affects 1 product.
Products include Pupnp Project Pupnp.
How do I fix CVE-2026-57488?
Upgrade to a fixed version.
Is CVE-2026-57488 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57488 exists.
Other vulnerabilities in pupnp
- CVE-2021-29462 DNS rebinding in pupnp
- CVE-2026-57486 pupnp: NULL pointer dereference in ixmlNode_compare crashes on non-namespaced attributes
- CVE-2026-57487 libupnp chunked HTTP bodies can bypass g_maxContentLength and be fully buffered
- CVE-2026-77630 pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing
- CVE-2021-28302 Denial of service in n/a
Sources
Also known as DEBIAN-CVE-2026-57488, GHSA-g6c2-x4r9-352g, UBUNTU-CVE-2026-57488.