pyload-ng: SSRF via HTTP Redirect Bypass in parse_urls API

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.0 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

EPSS

• CVE-2026-46561: 0.18% estimated exploitation activity in the next 30 days; percentile 7.08 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The SSRF mitigation added in commit 33c55da for GHSA-7gvf-3w72-p2pg is incomplete. The PREREQFUNCTION-based private IP check was correctly applied to HTTPChunk (download path) but not to HTTPRequest (used by the parseurls API). An authenticated attacker can supply a URL pointing to an attacker-controlled server that responds with a 302 redirect to an internal/private IP address, bypassing the isglobalhost() check on the initial URL. Details The parseurls API method validates the initial URL hostname: geturl() is imported from requestfactory.py and creates an HTTPRequest with default settings: HTTPRequest.init sets allowprivateip = True by default: The inithandle() method enables redirect following: The prerequestcallback that should block redirects to private IPs is a no-op when allowprivateip is True: The fix at commit 33c55da correctly set allowprivateip = False in HTTPChunk (httpchunk.py:136) for the download path, but HTTPRequest used by RequestFactory.geturl() retains…

Published by the source

21 May 2026, 19:54 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:45 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-8rp3-xc6w-5qp5

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-8rp3-xc6w-5qp5

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# Patch Next advisory brief: CVE-2026-46561

Advisory: pyload-ng: SSRF via HTTP Redirect Bypass in parse_urls API
IDs: CVE-2026-46561, GHSA-8rp3-xc6w-5qp5
Record: https://patchnext.com/advisories/cve-2026-46561 (revision 2, source checked 26 Oct 2026, 13:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pyload-ng 0.5.0b3.dev100. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI pyload-ng: affected < 0.5.0b3.dev100; fixed in 0.5.0b3.dev100

## Suggested inspection (read-only)
- `python -m pip show pyload-ng`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pyload-ng.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8rp3-xc6w-5qp5 (OSV record GHSA-8rp3-xc6w-5qp5 lists affected ranges: PyPI pyload-ng >=0 <0.5.0b3.dev100 (fixed))
- Verified: https://github.com/advisories/GHSA-8rp3-xc6w-5qp5 (GitHub-reviewed advisory GHSA-8rp3-xc6w-5qp5 lists affected ranges: PyPI pyload-ng >=0 <0.5.0b3.dev100)

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