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Advisory record · GHSA-c9ph-gxww-7744

Sandboxed Thymeleaf expressions vulnerable to improper recognition of unauthorized syntax patterns

CVSS 9.0 CriticalCriticalEPSS 0.0043 · 37th percentile

Critical, because:

  • CVSS score 9.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 4 May 2026, 21:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.thymeleaf:thymeleafMaven<3.1.5.RELEASE3.1.5.RELEASE
org.thymeleaf:thymeleaf-spring5Maven<3.1.5.RELEASE3.1.5.RELEASE
org.thymeleaf:thymeleaf-spring6Maven<3.1.5.RELEASE3.1.5.RELEASE
Identifiers
GHSA-c9ph-gxww-7744 · CVE-2026-41901
Weakness (CWE)
CWE-917 · CWE-1336
Tags
Published
4 May 2026
Updated
13 May 2026

Machine-written summary

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

Thymeleaf (org.thymeleaf:thymeleaf, thymeleaf-spring5 and thymeleaf-spring6) versions before 3.1.5.RELEASE are affected. An attacker who can supply unsanitized values that the application passes to the template engine can use specially crafted expressions to bypass the sandbox restrictions and achieve server-side template injection. Upgrade to 3.1.5.RELEASE; the source lists no workaround beyond not passing unvalidated data to the template engine.

Written 3 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
9.0 Critical 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.