Answer in brief
CVE-2026-63490 records a High severity (CVSS 7.5) vulnerability in Handlebars.java: Arbitrary file read in `SpringTemplateLoader` via URL-fragment suffix bypass. The current sources do not mark it as known exploited. The current feed maps jknack/handlebars.java (generic), com.github.jknack:handlebars-springmvc (maven), com.github.jknack:handlebars-springmvc (maven). 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 7.5. 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 jknack/handlebars.java (generic), com.github.jknack:handlebars-springmvc (maven), com.github.jknack:handlebars-springmvc (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| jknack/handlebars.javageneric | <4.5.3 | 4.5.3 |
| com.github.jknack:handlebars-springmvcmaven | <4.5.3 | 4.5.3 |
| com.github.jknack:handlebars-springmvcmaven | >=0 <4.5.3 | 4.5.3 |
Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 20, 2026
Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.3, com.github.jknack.handlebars.springmvc.SpringTemplateLoader resolves attacker-influenced Spring MVC view names through Spring ResourceLoader without the path-containment validation used by other URL-based loaders. In handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/SpringTemplateLoader.java, a view name using a file: or classpath: URL and ending with the # fragment delimiter places the appended .hbs suffix in the fragment, which FileUrlResource.exists() and URL.openStream() discard. HandlebarsViewResolver in handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/HandlebarsViewResolver.java then passes the attacker-controlled name to handlebars.compile(), allowing an unauthenticated remote attacker to read files accessible to the JVM when an application exposes a controller with a user-influenced view name. This issue is fixed in version 4.5.3.
Quoted source text, attributed separately from HOL analysis.