Streamlink: Arbitrary local file read via file:// URI in HLS and DASH

published 2026-05-11 5 mo ago modified 2026-06-17 4 mo ago also GHSA-hgqw-6m45-hw5f , PYSEC-2026-180 , EUVD-2026-32559

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 2

pypi streamlink 8.4.0
streamlink streamlink 8.4.0

debian opensuse

streamlink Debian 14 8.4.0-1

debian advisories DEBIAN-CVE-2026-44353

streamlink openSUSE Tumbleweed 8.4.0-1.1

opensuse advisories openSUSE-SU-2026:10733-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-44353 updated 2026-06-28 cvss 6.5

streamlink: Streamlink: Information disclosure via improper URI scheme validation in HLS and DASH parsers

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-27)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
OSV	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	streamlink	<8.4.0	8.4.0

Affected products

streamlink streamlink

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-73 External Control of File Name or Path

References

github.com /streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f
exploit, web, mitigation, vendor-advisory, evidence
nvd.nist.gov /vuln/detail/CVE-2026-44353
advisory
github.com /pypa/advisory-database/tree/main/vulns/streamlink/PYSEC-2026-180.yaml
web
github.com /streamlink/streamlink
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary