CVE-2026-44353: Streamlink: Arbitrary local file read via file:// URI in HLS and DASH

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-27 · updated 2026-06-17
Weakness: CWE-22

Description

Streamlink is a CLI utility which pipes video streams from various services into a video player. Prior to 8.4.0, Streamlink's HLS and DASH parsers do not validate the URI scheme of segment entries and other resources. A remote .m3u8 HLS playlist or .mpd DASH manifest can list file:///path/to/file as a segment, and streamlink will read that local file and write its contents to the output stream. This vulnerability is fixed in 8.4.0.

Affected products

streamlink: before 8.4.0 — fixed in 8.4.0

How to fix

Upgrade to a fixed version: streamlink 8.4.0. Check the vendor advisory for mitigations.

References

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