CVE-2026-12894: Improper Neutralization of Special Elements Used in a Template Engine in Quarkus quarkus-qute
Description
CVE-2026-12894 is a high-severity server-side template injection vulnerability in the Quarkus Qute template engine. The flaw exists in the ReflectionValueResolver component, which improperly restricts access to sensitive Java internal functions when processing certain data types like Enums. An attacker able to influence template content can exploit this to execute unauthorized commands on the server. Red Hat has issued an important security advisory with updates that address this issue in affected versions.
CVSS v3.1
Score 8.8high
Affected software
Quarkus
quarkus-qute
Red Hat
Red Hat Build of Apache Camel 3.33.3.SP1
Red Hat
Red Hat build of Quarkus 3.27.5.SP1
Red Hat
Red Hat build of Quarkus 3.33.3.SP1
Red Hat
Red Hat build of Apache Camel 4 for Quarkus 3
Red Hat
Red Hat build of Apache Camel 4 for Quarkus 3
Red Hat
Red Hat JBoss Enterprise Application Platform Expansion Pack
pkg:maven/Quarkus/io.quarkus:quarkus-quteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-12894 affects the Qute template engine used by Quarkus for dynamic content generation. The ReflectionValueResolver component fails to properly neutralize special elements, allowing attackers who can control template text to bypass restrictions and execute unauthorized commands on the server. This is a server-side template injection (SSTI) vulnerability that impacts versions >=3.27.0 <3.27.5.SP1 and >=3.33.0 <3.33.3.SP1. Red Hat's advisory confirms the issue and provides updated builds that fix the vulnerability.
Potential Impact
Successful exploitation allows an attacker with the ability to influence template text to execute arbitrary commands on the server, leading to full compromise of confidentiality, integrity, and availability of the affected system. The CVSS v3.1 score is 8.8 (high), reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Red Hat has released updated versions (RHBQ 3.27.5.SP1 and 3.33.3.SP1) that fix this vulnerability. Users should apply these official updates promptly. Before updating, back up existing installations including applications, configurations, and databases. No alternative mitigations are specified in the advisory; applying the official patch is required to remediate the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-22T12:14:04.768Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-12894","vendor":"Red Hat"}]
Threat ID: 6a957597acd9273b4917975a
Added to database: 08/31/2026, 12:37:43 UTC
Last enriched: 10/12/2026, 19:08:02 UTC
Last updated: 10/15/2026, 06:48:14 UTC
Views: 80
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