🛡️ CVE-2026-29778 — pyload-ng

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-23 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

pyLoad has an Arbitrary File Write via Path Traversal in edit_package()

The edit_package() function implements insufficient sanitization for the pack_folder parameter. The current protection relies on a single-pass string replacement of "../", which can be bypassed using crafted recursive traversal sequences.

Exploitation

An authenticated user with MODIFY permission can bypass the sanitization by submitting a payload such as:

pack_folder=..././..././..././tmp

After the single-pass replacement, this becomes:

../../../tmp

Because the traversal sequences are not properly validated, the resulting normalized path escapes the intended storage directory and writes files to /tmp or other locations.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability low.

Weakness class

CVE-2026-29778 is classified as CWE-23: Relative Path Traversal. Relative path sequences in user input are not neutralised, so requests can climb out of the intended directory.

Affected software

CVE-2026-29778 is recorded against 1 package.

  • pyload-ng (from 0.5.0b3.dev13 up to 0.5.0b3.dev97)

Timeline and source

Published on 5 March 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
github.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
CWE CWE-23
Public Exploit ⚠️ Yes
Source OSV
Published 2026-03-05
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
pyload-ng 0.5.0b3.dev13 0.5.0b3.dev97

Similar Threats

Exploit Protection

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