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Vulnerability · Published May 27, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity path traversal in streamlink from streamlink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 61.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12streamlinkno fix listedDEBIAN-CVE-2026-44353
Debian:13streamlinkno fix listedDEBIAN-CVE-2026-44353
Debian:14streamlink8.4.0-1DEBIAN-CVE-2026-44353
PyPIstreamlink8.4.0GHSA-hgqw-6m45-hw5f
PyPIstreamlink8.4.0PYSEC-2026-180
Ubuntu:22.04:LTSstreamlinkno fix listedUBUNTU-CVE-2026-44353
Ubuntu:24.04:LTSstreamlinkno fix listedUBUNTU-CVE-2026-44353
Ubuntu:25.10streamlinkno fix listedUBUNTU-CVE-2026-44353
Ubuntu:26.04:LTSstreamlinkno fix listedUBUNTU-CVE-2026-44353
Ubuntu:26.10streamlinkno fix listedUBUNTU-CVE-2026-44353

Affected products (as reported)

VendorProductVersions
streamlink streamlink < 8.4.0

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References