CVE-2026-17615 Red Hat CVE debrief

Who should care

Defenders responsible for RESTEasy deployments should assess exposure and potential impact. This includes operators, security teams, and vulnerability management teams who need to verify exposure of RESTEasy's SourceProvider and assess the potential impact of remote file reads.

Why it matters

CVE-2026-17615 allows an unauthenticated attacker to perform a remote file read, potentially exposing sensitive information. Defenders should verify exposure of RESTEasy's SourceProvider and assess the potential impact.

• Potential remote file reads may expose sensitive information
• Verification of RESTEasy configurations and updates is necessary
• Defenders should assess the potential impact on their environment

Technical summary

The vulnerability is due to the SourceProvider.writeTo() method creating a SAXParser without disabling external entity resolution, leading to an XML External Entity (XXE) vulnerability. This allows an unauthenticated attacker to perform a remote file read by sending a specially crafted XML body with a DOCTYPE declaration referencing external entities to an endpoint that accepts application/xml and returns Source or StreamSource. Defenders should prioritize verifying exposure of RESTEasy's SourceProvider and assessing the potential impact of remote file reads.

Defensive priority

Defenders should prioritize verifying exposure of RESTEasy's SourceProvider and assessing the potential impact of remote file reads.

Recommended defensive actions

• Verify exposure of RESTEasy's SourceProvider in your environment
• Assess the potential impact of remote file reads
• Review and update RESTEasy configurations to prevent external entity resolution
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation is limited. Defenders should verify exposure of RESTEasy's SourceProvider and assess the potential impact of remote file reads. The vulnerability allows an unauthenticated attacker to perform a remote file read, potentially exposing sensitive information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.