id: PYSEC-2026-1818
published: "2026-07-07T11:45:29.653767Z"
modified: "2026-07-07T17:25:10.928Z"
aliases:
- CVE-2024-21645
- GHSA-ghmw-rwh8-6qmr
summary: pyload Log Injection vulnerability
details: "### Summary\nA log injection vulnerability was identified in `pyload`. This vulnerability allows any unauthenticated actor to inject arbitrary messages into the logs gathered by `pyload`.\n\n### Details\n`pyload` will generate a log entry when attempting to sign in with faulty credentials. This entry will be in the form of `Login failed for user 'USERNAME'`. However, when supplied with a username containing a newline, this newline is not properly escaped. Newlines are also the delimiter between log entries. This allows the attacker to inject new log entries into the log file.\n\n### PoC\nRun `pyload` in the default configuration by running the following command\n```\npyload\n```\n\nWe can now sign in as the pyload user and view the logs at `http://localhost:8000/logs`.\n![Viewing the logs](https://user-images.githubusercontent.com/44903767/294433796-f2c96e39-8000-4649-99bb-9c50e786243d.png)\n\nAny unauthenticated attacker can now make the following request to inject arbitrary logs.\n\n```\ncurl 'http://localhost:8000/login?next=http://localhost:8000/' -X POST -H 'Content-Type: application/x-www-form-urlencoded' --data-raw $'do=login&username=wrong\\'%0a[2024-01-05 02:49:19]  HACKER               PinkDraconian  THIS ENTRY HAS BEEN INJECTED&password=wrong&submit=Login'\n```\n\nIf we now were to look at the logs again, we see that the entry has successfully been injected.\n![PoC2](https://user-images.githubusercontent.com/44903767/294434785-2fc6dce4-3e2c-4da0-8e80-a6bba882f756.png)\n\n### Impact\nForged or otherwise, corrupted log files can be used to cover an attacker’s tracks or even to implicate another party in the commission of a malicious act.\n"
affected:
- package:
    name: pyload-ng
    ecosystem: PyPI
    purl: pkg:pypi/pyload-ng
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 0.5.0b3.dev77
  versions:
  - 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.dev10
  - 0.5.0b2.dev11
  - 0.5.0b2.dev12
  - 0.5.0b2.dev9
  - 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
  - 0.5.0b3.dev69
  - 0.5.0b3.dev70
  - 0.5.0b3.dev71
  - 0.5.0b3.dev72
  - 0.5.0b3.dev73
  - 0.5.0b3.dev74
  - 0.5.0b3.dev75
  - 0.5.0b3.dev76
references:
- type: WEB
  url: https://github.com/pyload/pyload/security/advisories/GHSA-ghmw-rwh8-6qmr
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2024-21645
- type: WEB
  url: https://github.com/pyload/pyload/commit/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d
- type: PACKAGE
  url: https://github.com/pyload/pyload
- type: PACKAGE
  url: https://pypi.org/project/pyload-ng
- type: ADVISORY
  url: https://github.com/advisories/GHSA-ghmw-rwh8-6qmr
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N