High 7.5Published Oct 16, 2026

CVE-2026-57487libupnp chunked HTTP bodies can bypass g_maxContentLength and be fully buffered

Updated under an hour ago (Oct 26, 2026, 11:23 AM ET)

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It affects pupnp and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.36%, higher than 28% of scored CVEs.

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Exploited in the last 30 days

pupnp is an SDK for development of UPnP device and control point applications. Prior to 2.0.2, Transfer-Encoding: chunked causes the HTTP parser in upnp/src/genlib/net/http/httpparser.c to leave parser->content_length at zero while parser_parse_chunky_entity and parser_parse_chunky_body accumulate decoded bytes in parser->msg.entity. The g_maxContentLength checks in http_RecvMessage in upnp/src/genlib/net/http/httpreadwrite.c therefore reject oversized numeric Content-Length bodies but do not enforce the same limit on decoded chunked bodies. A remote peer that can reach a SOAP, GENA, miniserver, or control-point HTTP response path can make the process buffer an entity larger than the configured maximum, causing resource exhaustion and denial of service. This issue is fixed in 2.0.2.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.36% (percentile 28)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 16, 2026

Affected products

Affected products

pupnp pupnp pupnp:pupnp (from the name)	before 2.0.2	CNA record
pupnp_project pupnp pupnp_project:pupnp	before 2.0.2	NVD

References

https://github.com/pupnp/pupnp/security/advisories/GHSA-gcj7-j9f7-q84cx-refsource-confirm, exploit, vendor-advisory
https://github.com/pupnp/pupnp/commit/9ff9bc583ad8ee4ba022634434a7b71db9bd96e1x-refsource-misc, patch
https://github.com/pupnp/pupnp/releases/tag/release-2.0.2x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.