CVE-2026-61681

MEDIUM 4.1

Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

CVSS Score

4.1

EPSS Score

0.0%

EPSS Percentile

0th

Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, the SNS UnsubscribeConfirmation handler in internal/integrations/ingestors/sns/sns.go calls http.Get() on payload.UnsubscribeURL after VerifyPayload() even though BuildSignature() excludes UnsubscribeURL, allowing an authenticated Hatchet tenant to replace that field in an otherwise valid AWS-signed message with an internal URL. The server-side request can reach EC2 Instance Metadata Service, internal services, and internal HTTP APIs, potentially exposing IAM credentials or network-accessible data and functionality. This issue is fixed in version 0.91.1.

CWE	CWE-918
Vendor	hatchet-dev
Product	hatchet
Published	Sep 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

hatchet-dev / hatchet

< 0.91.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-fjwv-jf2v-j499 github.com: https://github.com/hatchet-dev/hatchet/commit/2d211bce16e5022afaf95780de82dc30e0bcba98