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GHSA-w9hm-4m3m-fxmm

HighCVSS 8.6 / 10
Published Aug 6, 2026·Last modified Aug 6, 2026
Affected Components(1)
npm logongx-extended-pdf-viewer
27.0.0-rc.0 – 29.0.0-rc.3
Description

ngx-extended-pdf-viewer embeds a fork of Mozilla's pdf.js rather than depending on pdfjs-dist, so this vulnerability is not visible to dependency scanners through package.json.

Impact

Opening a malicious PDF can execute attacker-controlled JavaScript in the context of the hosting page. Upstream advisory: GHSA-hq66-cqwq-w95j / CVE-2026-16633.

Exposure.

The sandbox half of the issue requires enableScripting, which pdf.js enables by default but this library does not — so the default configuration was less exposed than upstream's. The other half concerns XFA rich text and is reachable whenever enableXfa is true, which is the default here. Do not assume the default configuration was safe.

Patches

29.0.0-rc.3 cherry-picks Mozilla's fix (pdf.js 6.2.108) into both the stable and bleeding-edge engines. Only the latest release receives security updates.

Workarounds

Set pdfDefaultOptions.enableXfa = false if you do not need XFA forms, and/or apply a CSP disallowing inline script-src.

Verifying.

From 29.0.0 the package ships sbom.json and vex.json. The SBOM records the applied fix as a CycloneDX pedigree.patches entry; the VEX carries a resolved_with_pedigree statement so scanners stop flagging the engine's nominal version.

Risk Scores
Base Score
8.6

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.

Threat Intelligence
6.2

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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