XML External Entity Vulnerability in RESTEasy by Red Hat
CVE-2026-17615

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Apache Camel 4 For Quarkus 3
Red Hat Build Of Apicurio Registry 3
Red Hat Build Of Debezium 3
Red Hat Build Of Keycloak
Vendor
CVE Published:
31 August 2026

What is CVE-2026-17615?

A security flaw in RESTEasy's SourceProvider allows unauthenticated attackers to exploit an XML External Entity (XXE) vulnerability. This occurs when a specially crafted XML body containing a DOCTYPE declaration that references external entities is sent to a susceptible endpoint. The flaw arises from the SourceProvider.writeTo() method, which initializes a SAXParser without disabling the resolution of external entities. Consequently, the server may unwittingly expose sensitive file contents in its HTTP response, leading to a potential information disclosure threat.

References

https://access.redhat.com/security/cve/CVE-2026-17615
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507635
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Leon Zlobecki for reporting this issue.
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