Answer in brief
CVE-2025-66286 records a Medium severity (CVSS 4.7) vulnerability in Webkitgtk: authorization bypass through webpage::send-request signal handler. The current sources do not mark it as known exploited. The current feed maps Red Hat/webkit2gtk3 (generic), Red Hat/webkitgtk3 (generic), Red Hat/webkitgtk4 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.7. 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 Red Hat/webkit2gtk3 (generic), Red Hat/webkitgtk3 (generic), Red Hat/webkitgtk4 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Red Hat/webkit2gtk3generic | * | Not reported |
| Red Hat/webkitgtk3generic | * | Not reported |
| Red Hat/webkitgtk4generic | * | Not reported |
Published upstream
Apr 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 22, 2026
An API design flaw in WebKitGTK and WPE WebKit allows untrusted web content to unexpectedly perform IP connections, DNS lookups, and HTTP requests. Applications expect to use the WebPage::send-request signal handler to approve or reject all network requests. However, certain types of HTTP requests bypass this signal handler.
Quoted source text, attributed separately from HOL analysis.