What is CVE-2026-41901?

CVE-2026-41901 is a critical-severity vulnerability in Thymeleaf, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 9.0/10. Published 2026-05-12.

How severe is CVE-2026-41901?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Is CVE-2026-41901 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Thymeleaf

CVE-2026-41901

Thymeleaf is a server-side Java template engine for web and standalone environments. Prior to 3.1.5.RELEASE, a security bypass vulnerability exists in the expression execution mechanisms of Thymeleaf. Although the library provides mechanis…

Vulnerability class: Log4Shell (CVE-2021-44228)

EPSS: 0.001 (27.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Thymeleaf — versions < 3.1.5.RELEASE

Weakness classification (CWE)

Public proof-of-concept exploits

HORKimhab/CVE-2026-41901

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-41901?: CVE-2026-41901 is a critical-severity vulnerability in Thymeleaf, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 9.0/10. Published 2026-05-12.
How severe is CVE-2026-41901?: Critical severity. CVSS v3 base score is 9.0 out of 10.
Is CVE-2026-41901 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.