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CVE-2026-61681— Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

Quick assessment

Affected
hatchet-dev hatchet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 VerifyP

CVSS 4.1 · Medium EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
hatchet-dev hatchet < 0.91.1 affected
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I. Basic Information for CVE-2026-61681

Vulnerability Information

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Vulnerability Title
Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hatchet-dev hatchet < 0.91.1 -

II. Public POCs for CVE-2026-61681

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III. Intelligence Information for CVE-2026-61681

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Patches & Fixes for CVE-2026-61681 (1)

Other References for CVE-2026-61681 (1)

Same Patch Batch · hatchet-dev · 2026-09-21 · 5 CVEs total

CVE-2026-61687 7.1 HIGH hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in Valid
CVE-2026-63342 6.3 MEDIUM Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check
CVE-2026-88978 4.3 MEDIUM Hatchet DurableTask WorkerStatus gRPC resolves caller-supplied durable-task UUIDs via List
CVE-2026-84298 3.1 LOW Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher

IV. Related Vulnerabilities

Same product: hatchet
Same vendor: hatchet-dev
Same weakness: CWE-918

V. Comments for CVE-2026-61681

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