CVE-2026-54461 HabitRPG CVE debrief

Who should care

Defenders responsible for Habitica deployments should assess exposure and apply the patch to prevent potential performance impact or Node.js process halts. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure and apply the patch promptly to prevent potential performance impact or Node.js process halts.

Why it matters

Defenders should care about CVE-2026-54461 because it allows authenticated callers to impact Habitica application performance or halt Node.js processes, requiring verification of exposure and prompt patch application.

• Degradation of application performance due to computationally expensive regular expressions.
• Potential halting of Node.js processes, impacting application availability.
• Verification of exposure and patch application priority for Habitica deployments.

Technical summary

The vulnerability is caused by a lack of sanitization of a query parameter on the /api/v3/groups/:groupId/members route, which can be interpreted as a regular expression. An authenticated caller can supply a computationally expensive regular expression that degrades application performance or halts Node.js processes. The issue is fixed in version 5.48.2, and defenders should prioritize verifying exposure and applying the patch to prevent potential performance impact or Node.js process halts. The vulnerability impacts application performance and availability, requiring prompt verification of exposure and patch application.

Defensive priority

Defenders should prioritize verifying exposure and applying the patch, as the vulnerability can impact application performance.

Recommended defensive actions

• Verify exposure by checking if the application is running a vulnerable version (prior to 5.48.2) and if authenticated callers can access the /api/v3/groups/:groupId/members route.
• Apply the patch by updating to version 5.48.2 or later.
• Monitor application performance and Node.js processes for potential impact.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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.

Evidence notes

The vulnerability is described in the CVE record and NVD vulnerability detail page. The issue is fixed in version 5.48.2, as noted in the source references. Evidence is limited to public CVE and NVD records, with no additional information available. Defenders should verify exposure by checking the application version and reviewing access to the /api/v3/groups/:groupId/members route.

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.