Is org.thymeleaf:thymeleaf affected by CVE-2026-40478?

Maven org.thymeleaf:thymeleaf is affected in <3.1.4.RELEASE.

Is CVE-2026-40478 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

critical

CVE-2026-40478

Q: Is CVE-2026-40478 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

Maven · org.thymeleaf:thymeleaf • Maven · org.thymeleaf:thymeleaf-spring5 • Maven · org.thymeleaf:thymeleaf-spring6

Summary

Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf

Severity: critical
EPSS: 0.6% (p43)
Also known as: GHSA-xjw8-8c5c-9r79#org.thymeleaf:thymeleaf, GHSA-xjw8-8c5c-9r79#org.thymeleaf:thymeleaf-spring5, GHSA-xjw8-8c5c-9r79#org.thymeleaf:thymeleaf-spring6
Published: 2026-04-15

References

https://github.com/thymeleaf/thymeleaf/security/advisories/GHSA-xjw8-8c5c-9r79
https://nvd.nist.gov/vuln/detail/CVE-2026-40478
https://github.com/thymeleaf/thymeleaf

Related advisories

CVE-2026-41901 — critical · Maven/org.thymeleaf:thymeleaf
CVE-2026-40477 — critical · Maven/org.thymeleaf:thymeleaf

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.