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Advisory record · GHSA-g29j-rwfv-h99w

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

CVSS 7.5 HighEPSS 0.0069 · 52nd percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 22:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.github.jknack:handlebars-springmvcMaven<4.5.34.5.3
Identifiers
GHSA-g29j-rwfv-h99w · CVE-2026-63490
Weakness (CWE)
CWE-22 · CWE-23 · CWE-552
Tags
Published
2 Sept 2026
Updated
2 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Handlebars.java versions below 4.5.3 of the com.github.jknack:handlebars-springmvc package are vulnerable to arbitrary file read through SpringTemplateLoader. A remote, unauthenticated attacker who can influence a Spring MVC view name, such as through a controller that returns user-supplied view names, can append a URL fragment character to make the template suffix check ineffective, allowing reads of arbitrary files readable by the JVM process. Upgrade to version 4.5.3, which is listed as the fixed release; no other workaround is given.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0069, the 52nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:18 UTC First seen by agentprime
  2. 31 Oct 2026, 14:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.