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HIGH severity

CVE-2026-29778

HIGH

CVE-2026-29778 is a high-severity (CVSS 7.1) CWE-23 vulnerability in pyload-ng_project pyload-ng. O3 Security detects and blocks CVE-2026-29778 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

pyLoad is a free and open-source download manager written in Python. From version 0.5.0b3.dev13 to 0.5.0b3.dev96, the edit_package() function implements insufficient sanitization for…

Published
Mar 7, 2026
Updated
Jun 17, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Jun 17, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

pyLoad is a free and open-source download manager written in Python. From version 0.5.0b3.dev13 to 0.5.0b3.dev96, 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. This issue has been patched in version 0.5.0b3.dev97.

Affected Products

1 product · 1 configurations
Application
pyload-ngpyload-ng_project
≥ 0.5.0b3.dev13 && < 0.5.0b3.dev97
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every pyload-ng_project pyload-ng deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the pyload-ng_project pyload-ng security patch or hotfix for CVE-2026-29778 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-29778 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-29778. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

pyLoad is a free and open-source download manager written in Python. From version 0.5.0b3.dev13 to 0.5.0b3.dev96, 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. This issue has been patched in version 0.5.0b3.dev97.
O3 Security · Runtime Protection

Is CVE-2026-29778 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-29778 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-29778: Pyload-Ng CWE-23 (High 7.1) | O3 Security