# CVE-2026-123815: pyLoad: Tar extraction creates device nodes and FIFOs (member types not filtered; tarfile extractall without filter=)

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev102, UnTar._safe_extractall in src/pyload/plugins/extractors/UnTar.py validates archive member paths and link targets but does not call TarInfo.isdev to reject special tar member types before calling tarfile.extractall. On supported Python 3.9 through 3.13 runtimes, tarfile defaults to the fully_trusted extraction filter, so a user with ADD and STATUS permissions can cause extraction of a crafted archive containing character devices, block devices, or FIFOs. Python 3.14 defaults to a safe extraction filter. When pyLoad runs with operating-system privileges that permit device creation, including the official root-based Docker deployment, the archive can expose raw devices and compromise the host. Non-root deployments can still create FIFOs that cause hangs or IPC confusion. This issue is fixed in version 0.5.0b3.dev102.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- pyload / pyload: < 0.5.0b3.dev102 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 9.4 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-22, CWE-434

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/pyload/pyload/security/advisories/GHSA-fr26-jjhm-638c (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/pyload/pyload/commit/09eec1b431b6942a1917f094f2c77bfbf5637f60 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-123815; retrieved 2026-11-09; source updated 2026-11-09

Revision: 32ce06b50aea4b766d727a26473e3a0a69d165917d9b3175ecff663c84090152

Canonical: https://y2.dev/cve/CVE-2026-123815

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