Medium
Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-61681
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:13 UTC · Revision 1
Source evidence
Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler
core-osv · Original sourcePublished 21 Sept 2026, 15:42 UTC
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.
osv:CVE-2026-61681
Complete source record
{
"id": "3dfcdde2cf417e54eae9813e4735d4720d6e4d650a1a9adc47a8b64e5ab299b6",
"url": "https://osv.dev/vulnerability/CVE-2026-61681",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler",
"summary": "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.",
"evidence": "osv:CVE-2026-61681",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-61681",
"aliases": [
"CVE-2026-61681",
"GHSA-fjwv-jf2v-j499",
"GO-2026-6565"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/hatchet-dev/hatchet",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "06c1fe43543e853ea98ecc2e6a575e2b8310bbeb"
},
{
"fixed": "2d211bce16e5022afaf95780de82dc30e0bcba98"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.91.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "2d211bce16e5022afaf95780de82dc30e0bcba98"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61681.json"
}
}
],
"modified": "2026-10-28T02:30:29.534744504Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61681.json",
"https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-fjwv-jf2v-j499",
"https://nvd.nist.gov/vuln/detail/CVE-2026-61681",
"https://github.com/hatchet-dev/hatchet/commit/2d211bce16e5022afaf95780de82dc30e0bcba98"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61681.json"
}
},
"related_cves": [
{
"value": "CVE-2026-61681",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496246,
"published_at": "2026-09-21T15:42:21.803+00:00"
}