Answer in brief
CVE-2026-27902 records a Medium severity vulnerability in XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers. The current sources do not mark it as known exploited. The current feed maps svelte (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
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.
The current feed maps svelte (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| sveltenpm | >=5.53.0<=5.53.4 | Not reported |
Published upstream
Feb 25, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Feb 25, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 25, 2026
Errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`.
Quoted source text, attributed separately from HOL analysis.