Arbitrary file read via missing loader boundary checks
Published Jul 8, 2026 · Updated Jul 8, 2026
Path traversal in jknack Handlebars.java before 4.5.2 allows remote attackers to read arbitrary files through untrusted template names. FileTemplateLoader accepted resolved paths without canonical base-directory enforcement, while classpath loaders failed to normalize traversal segments and enforce prefix boundaries. Reachability requires an embedding application to pass user-controlled request data to Handlebars.compile(); disclosure is limited to files or classpath resources readable by the JVM process.
Summary
What happened
Path traversal in jknack Handlebars.java before 4.5.2 allows remote attackers to read arbitrary files through untrusted template names. FileTemplateLoader accepted resolved paths without canonical base-directory enforcement, while classpath loaders failed to normalize traversal segments and enforce prefix boundaries. Reachability requires an embedding application to pass user-controlled request data to Handlebars.compile(); disclosure is limited to files or classpath resources readable by the JVM process.
The record
- CVE
- CVE-2026-55760
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Vendor
- jknack
- Product
- Handlebars.java
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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