Path Traversal in Streamlink
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Streamlink — versions < 8.4.0
Weakness classification (CWE)
References
- github.com/streamlink/streamlink/security/advisories/GHSA-hgqw-6m45-hw5f (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44353?
- CVE-2026-44353 is a medium-severity vulnerability in Streamlink, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-05-27.
- How severe is CVE-2026-44353?
- Medium severity. CVSS v3 base score is 6.5 out of 10.