CVE-2026-55760High· 7.5▾ Twilighthandlebars.java FileTemplateLoader Path Traversal
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.4%
0.4% → 0.5%
Any application that passes user-controlled input to Handlebars.compile() using a FileTemplateLoader (or ClassPathTemplateLoader) is vulnerable to arbitrary file read. This is a realistic attack surface for web applications that use template names from URL path parameters, request parameters, or other user-controlled sources.
com.github.jknack:handlebars:4.5.2
Validate template name is derived from user input.
if (!file.getPath().startsWith(new File(prefix).getCanonicalPath())) {
throw new IOException("Path traversal attempt detected: " + location);
}
com.github.jknack:handlebars < 4.5.2Upgrade to a patched release:
com.github.jknack:handlebars 4.5.2Connected by shared product, vendor, weakness, or advisory.
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