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CVE-2026-63490— Handlebars.java: Arbitrary file read in `SpringTemplateLoader` via URL-fragment suffix bypass

Quick assessment

Affected
jknack handlebars.java
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Handlebars.java 提供与 Java 集成的无逻辑、语义化的 Mustache 模板功能。在版本 4.5.3 之前，类 通过 Spring ResourceLoader 解析由攻击者控制的 Spring MVC 视图名称时，未采用其他基于 URL 的加载器所使用的路径内容验证（path-containment validation）。 在文件 中，如果视图名称使用 或 URL 协议，并以 片段分隔符结尾，则附加的 后缀会被置于片段部分。随后， 和 方法会丢弃该片段部分，导致文件扩展名未被正确识别。 接着

CVSS 7.5 · High EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
jknack handlebars.java < 4.5.3 affected
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I. Basic Information for CVE-2026-63490

Vulnerability Information
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Vulnerability Title
Handlebars.java: Arbitrary file read in `SpringTemplateLoader` via URL-fragment suffix bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jknack handlebars.java < 4.5.3 -

II. Public POCs for CVE-2026-63490

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10251 chars
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III. Intelligence Information for CVE-2026-63490

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Patches & Fixes for CVE-2026-63490 (1)

Vendor Advisories for CVE-2026-63490 (1)

Vendor Pages for CVE-2026-63490 (1)

IV. Related Vulnerabilities

Same product: handlebars.java
Same vendor: jknack
Same weakness: CWE-22

V. Comments for CVE-2026-63490

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