CVE-2026-57487Public exploitNetwork attack vectorHinoki check available

Denial of service via unbounded chunked-body buffering

Published Oct 16, 2026 · Updated Oct 16, 2026

Resource exhaustion in PUPnP Portable SDK for UPnP Devices (libupnp) before 2.0.2 allows remote attackers to disrupt service via HTTP. In http_RecvMessage(), size checks use content_length, which stays zero for chunked transfers while decoded bytes accumulate beyond g_maxContentLength. Exploitation requires a reachable SOAP, GENA, miniserver, or control-point HTTP response path; the resulting service-interruption mode is not established.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in PUPnP Portable SDK for UPnP Devices (libupnp) before 2.0.2 allows remote attackers to disrupt service via HTTP. In http_RecvMessage(), size checks use content_length, which stays zero for chunked transfers while decoded bytes accumulate beyond g_maxContentLength. Exploitation requires a reachable SOAP, GENA, miniserver, or control-point HTTP response path; the resulting service-interruption mode is not established.

The record

CVE
CVE-2026-57487
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
PUPnP
Product
Portable SDK for UPnP Devices (libupnp)
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PUPnP · Portable SDK for UPnP Devices (libupnp)version=< 2.0.2

Published CVSS scores

7.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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