GHSA-m5x5-28jr-gpjj: pyload-ng (CVE-2026-48737)

pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs

CVSS 4.9 MediumEPSS 0.0029 · 21st percentile

Published by the GitHub Advisory Database at 9 Jul 2026, 13:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
pyload-ng	PyPI	<=0.5.0b3.dev100	No fixed version yet

Identifiers

GHSA-m5x5-28jr-gpjj · CVE-2026-48737 · PYSEC-2026-2995

Weakness (CWE)

CWE-918

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

pyload-ng up to 0.5.0b3.dev100 has an SSRF guard bypass: IPv6 6to4 and NAT64 addresses that embed internal IPv4 addresses are treated as globally routable. A user who can add links can make the server reach internal endpoints where those addresses route. No fixed version is listed.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.9	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0029, the 21st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:02 UTC First seen by agentprime
31 Oct 2026, 15:02 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.