PYSEC-2026-125

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/pyload-ng/PYSEC-2026-125.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-125
Aliases
Published
2026-04-21T18:16:51Z
Modified
2026-05-20T09:19:15Z
Severity
  • 4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L CVSS Calculator
Summary
[none]
Details

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 (request_queue_size=512), this creates a race condition where an attacker's request can influence the Secure flag on other users' session cookies — either downgrading cookie security behind a TLS proxy or causing a session denial-of-service on plain HTTP deployments. This vulnerability is fixed in 0.5.0b3.dev98.

References

Affected packages

PyPI / pyload-ng

Package

Name
pyload-ng
View open source insights on deps.dev
Purl
pkg:pypi/pyload-ng

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.5.0b3.dev69

Affected versions

0.*
0.5.0a5.dev528
0.5.0a5.dev532
0.5.0a5.dev535
0.5.0a5.dev536
0.5.0a5.dev537
0.5.0a5.dev539
0.5.0a5.dev540
0.5.0a5.dev545
0.5.0a5.dev562
0.5.0a5.dev564
0.5.0a5.dev565
0.5.0a6.dev570
0.5.0a6.dev578
0.5.0a6.dev587
0.5.0a7.dev596
0.5.0a8.dev602
0.5.0a9.dev615
0.5.0a9.dev629
0.5.0a9.dev632
0.5.0a9.dev641
0.5.0a9.dev643
0.5.0a9.dev655
0.5.0a9.dev806
0.5.0b1.dev1
0.5.0b1.dev2
0.5.0b1.dev3
0.5.0b1.dev4
0.5.0b1.dev5
0.5.0b2.dev9
0.5.0b2.dev10
0.5.0b2.dev11
0.5.0b2.dev12
0.5.0b3.dev13
0.5.0b3.dev14
0.5.0b3.dev17
0.5.0b3.dev18
0.5.0b3.dev19
0.5.0b3.dev20
0.5.0b3.dev21
0.5.0b3.dev22
0.5.0b3.dev24
0.5.0b3.dev26
0.5.0b3.dev27
0.5.0b3.dev28
0.5.0b3.dev29
0.5.0b3.dev30
0.5.0b3.dev31
0.5.0b3.dev32
0.5.0b3.dev33
0.5.0b3.dev34
0.5.0b3.dev35
0.5.0b3.dev38
0.5.0b3.dev39
0.5.0b3.dev40
0.5.0b3.dev41
0.5.0b3.dev42
0.5.0b3.dev43
0.5.0b3.dev44
0.5.0b3.dev45
0.5.0b3.dev46
0.5.0b3.dev47
0.5.0b3.dev48
0.5.0b3.dev49
0.5.0b3.dev50
0.5.0b3.dev51
0.5.0b3.dev52
0.5.0b3.dev53
0.5.0b3.dev54
0.5.0b3.dev57
0.5.0b3.dev60
0.5.0b3.dev62
0.5.0b3.dev64
0.5.0b3.dev65
0.5.0b3.dev66
0.5.0b3.dev67
0.5.0b3.dev68

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/pyload-ng/PYSEC-2026-125.yaml"