CVE-2026-44353: Streamlink is a CLI utility which pipes video streams from various services into a video player

Routine

MEDIUM 6.5UPGRADE

CVE-2026-44353 is a medium-severity flaw (CVSS 6.5) affecting streamlink. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-05-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: streamlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 17:16 UTCPublished CVE record published
2026-06-17 10:50 UTCUpdated Record last modified

streamlink streamlink UPGRADE

Affected: < 8.4.0

Fixed in: 8.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show streamlink

2. UPGRADE to 8.4.0

pip install --upgrade "streamlink>=8.4.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44353?

streamlink: upgrade to 8.4.0. Exact commands for each OS are on this page.

Is CVE-2026-44353 being exploited?

CVE-2026-44353 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44353 affect?

CVE-2026-44353 affects streamlink. Severity is medium (CVSS 6.5). 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 pla

How urgent is CVE-2026-44353?

Priority 37/100. Public exploit reference

References

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