CVE-2026-19913

Answer in brief

CVE-2026-19913 records a Unknown severity vulnerability in CVE-2026-19913. The current sources do not mark it as known exploited. The current feed maps Kaltura/Kaltura HTML5 Video Player, html5lib library (generic), Kaltura/Kaltura HTML5 Video Player, html5lib library (generic), Kaltura/Kaltura HTML5 Video Player, html5lib library (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Kaltura/Kaltura HTML5 Video Player, html5lib library (generic), Kaltura/Kaltura HTML5 Video Player, html5lib library (generic), Kaltura/Kaltura HTML5 Video Player, html5lib library (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Kaltura/Kaltura HTML5 Video Player, html5lib librarygeneric	0	Not reported
Kaltura/Kaltura HTML5 Video Player, html5lib librarygeneric	v2.45	Not reported
Kaltura/Kaltura HTML5 Video Player, html5lib librarygeneric	0 \|\| 2.45	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Kaltura/Kaltura HTML5 Video Player, html5lib library, Kaltura/Kaltura HTML5 Video Player, html5lib library, Kaltura/Kaltura HTML5 Video Player, html5lib library.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Source referencekb.cert.org

Upstream source description

The Kaltura HTML5 player (mwEmbed / html5lib) contains a local file disclosure vulnerability due to improper validation of the ServiceUrl parameter in mwEmbedLoader.php. This parameter is used as the base URL for a backend request and accepts non‑HTTP schemes such as file://. When an exception or error occurs, the response is subsequently deserialized and its raw contents are reflected to the client in an error message; this enables an unauthenticated, remote attacker to read any arbitrary internal file reachable by the server. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.

Quoted source text, attributed separately from HOL analysis.