CVE-2026-44353: streamlink Path Traversal

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
streamlink	streamlink	< 8.4.0

References

Advisories & Patches

https://github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f https://github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f

Exploits

https://github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f https://github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f

Frequently Asked Questions

What is CVE-2026-44353? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-44353? +

CVE-2026-44353 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44353? +

CVE-2026-44353 affects products from streamlink, specifically: streamlink. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44353? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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