CVE-2026-61681 hatchet-dev CVE debrief

Who should care

Defenders responsible for systems using the github.com/hatchet-dev/hatchet package should assess exposure and take mitigation actions. This includes verifying the affected systems, applying patches, and monitoring for suspicious activity.

Why it matters

The SSRF vulnerability in github.com/hatchet-dev/hatchet allows attackers to make unauthorized requests, potentially leading to data breaches or system compromise. Defenders should prioritize verifying affected systems, assessing exposure, and applying patches or mitigations.

• Potential unauthorized requests being made on behalf of the server
• Possible data breaches or system compromise

Technical summary

The github.com/hatchet-dev/hatchet package is vulnerable to Server-Side Request Forgery (SSRF) attacks through its SNS UnsubscribeConfirmation Handler. The handler does not properly validate the UnsubscribeURL, allowing an attacker to manipulate it and make unauthorized requests on behalf of the server. This could potentially lead to data breaches or system compromise. Defenders should prioritize verifying affected systems, assessing exposure, and applying patches or mitigations as soon as possible. The vulnerability has a CVSS score of 4.1, indicating a medium severity level.

Defensive priority

Defenders should prioritize verifying the affected systems, assessing exposure, and applying patches or mitigations as soon as possible.

Recommended defensive actions

• Verify if the system is using the affected package and assess exposure
• Apply patches or mitigations provided by the vendor
• Monitor for suspicious activity that could indicate 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 vulnerability was reported by an external source and documented in the OSV vulnerability database with limited detail. The CVE Program and NVD have also published records for this vulnerability. Defenders should verify the affected systems, assess exposure, and apply patches or mitigations as soon as possible. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability.

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.