CVE-2026-40594: pyLoad is a free and open-source download manager written in Python

This week

MEDIUM 4.8REMOTEUPGRADE

CVE-2026-40594 is a medium-severity flaw (CVSS 4.8) affecting pyload-ng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev98, the set_session_cookie_secure before_request handler in src/pyload/webui/app/__init__.py reads the X-Forwarded-Proto header from any HTTP request without validating that the request originates from a trusted proxy, then mutates the global Flask configuration SESSION_COOKIE_SECURE on every request. Because pyLoad uses the multi-threaded Cheroot WSGI server

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-04-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pyload-ng project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 18:16 UTCPublished CVE record published
2026-06-17 10:45 UTCUpdated Record last modified

pyload-ng project pyload-ng UPGRADE

Affected: < 0.5.0b3.dev69

Fixed in: 0.5.0b3.dev69

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show pyload-ng

2. UPGRADE to 0.5.0b3.dev69

pip install --upgrade "pyload-ng>=0.5.0b3.dev69"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40594?

pyload-ng: upgrade to 0.5.0b3.dev69. Exact commands for each OS are on this page.

Is CVE-2026-40594 being exploited?

CVE-2026-40594 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40594 affect?

CVE-2026-40594 affects pyload-ng. Severity is medium (CVSS 4.8). pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev98, the set_session_cookie_secure before_request handler in src/pyload/webui/app/__init__.py reads the X-Forwarded-Proto header from any HTTP request w

How urgent is CVE-2026-40594?

Priority 28/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · Flask vulnerabilities

Related CVEs

CVE-2026-42315 HIGH 8.1 UPGRADE pyLoad is a free and open-source download manager written in Python
CVE-2026-42314 MEDIUM 6.5 UPGRADE pyLoad is a free and open-source download manager written in Python
CVE-2026-42313 HIGH 8.3 UPGRADE pyLoad is a free and open-source download manager written in Python
CVE-2026-42312 MEDIUM 6.8 UPGRADE pyLoad is a free and open-source download manager written in Python

References

← Back to latest CVEs