Quick answers
- Is CVE-2026-118492 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118492 being exploited in the wild.
- How severe is CVE-2026-118492?
- Informational severity, published 9 November 2026.
- Which products and versions are affected?
- Eclipse Langium 3.0.0 and later.
- Is there a fix for CVE-2026-118492?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-118492 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118492?
- Check whether you run Eclipse Langium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The langium-sprotty package does not HTML-escape diagnostic messages rendered by the `addHoverPopupHandler` function. If a grammar permits cross-reference text to include HTML markup (e.g., via a STRING terminal), an unresolved cross-reference generates a diagnostic containing unescaped attacker-supplied text. When a user hovers over the error marker in a Sprotty diagram, the injected JavaScript executes in the browser or webview context, enabling arbitrary code execution.
Affected products
- Eclipse Langium 3.0.0 and later
Timeline
- 2026-11-09: disclosed