CVE-2026-73562 Automattic CVE debrief

Who should care

Developers and administrators using Mongoose in their applications should assess their exposure and update to the fixed versions to prevent potential exploitation. This includes reviewing code that uses Mongoose update methods, validating user input, and verifying affected versions. Security teams and vulnerability management teams should also review the vulnerability and implement compensating controls if necessary. Operators and platform administrators  

Why it matters

CVE-2026-73562 is a prototype pollution vulnerability in Mongoose that can lead to application integrity and availability impacts. Defenders should update to fixed versions and review code using Mongoose update methods.

• Potential application integrity impacts due to prototype pollution
• Potential availability impacts due to exploitation of Mongoose update casting
• Verification of affected versions and update to fixed versions is necessary
• Review of code using Mongoose update methods is required

Technical summary

The vulnerability allows attackers to exploit Mongoose update casting with a __proto__.x dotted path under $Set, potentially causing application integrity and availability impacts. This issue is fixed in Mongoose versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2. Affected product deployments should be reviewed for exposure, and code using Mongoose update methods should be updated to prevent exploitation. The fix involves updating Mongoose to a secure version and validating user input to prevent exploitation. This vulnerability can lead to application integrity and availability impacts if not addressed.

Defensive priority

Defenders should prioritize updating Mongoose to versions 6.13.10, 7.8.10, 8.24.1, or 9.7.2 to mitigate this vulnerability. Review and update code that uses Mongoose update methods, especially those that directly incorporate user input.

Recommended defensive actions

• Update Mongoose to versions 6.13.10, 7.8.10, 8.24.1, or 9.7.2
• Review and update code that uses Mongoose update methods
• Validate user input to prevent exploitation
• 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 CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. GitHub commits and security advisories offer technical details and fixes.

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.