CVE-2026-44353Public exploitNetwork attack vector

Local file read via unrestricted resource schemes

Published May 27, 2026 · Updated May 27, 2026

Path traversal in Streamlink before 8.4.0 allows remote attackers to read local files through a malicious HLS or DASH manifest. The HLS and DASH parsers pass segment and resource URIs to a worker without restricting their schemes, so file:// entries resolve against the local filesystem. A victim must process an attacker-controlled manifest; readable data is copied only to Streamlink's output sink and is not sent directly to the attacker.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Streamlink before 8.4.0 allows remote attackers to read local files through a malicious HLS or DASH manifest. The HLS and DASH parsers pass segment and resource URIs to a worker without restricting their schemes, so file:// entries resolve against the local filesystem. A victim must process an attacker-controlled manifest; readable data is copied only to Streamlink's output sink and is not sent directly to the attacker.

The record

CVE
CVE-2026-44353
Published
May 27, 2026
Updated
May 27, 2026
Vendor
Streamlink
Product
Streamlink
Classifications
CWE-22, CWE-73, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Streamlink · Streamlinkversion=< 8.4.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73External Control of File Name or Path
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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