{"id":"CVE-2026-61681","aliases":["GHSA-fjwv-jf2v-j499","GO-2026-6565"],"url":"https://o3.security/vulnerability/CVE-2026-61681","summary":"Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler","details":"### Summary\n  The SNS `UnsubscribeConfirmation` handler in `internal/integrations/ingestors/sns/sns.go` makes an unvalidated\n  `http.Get()` call to `payload.UnsubscribeURL` without any URL restriction. Because `UnsubscribeURL` is intentionally\n  excluded from the `BuildSignature()` signed field list, an attacker can replace this field in a legitimately\n  AWS-signed message with an arbitrary internal URL, bypassing the `VerifyPayload()` signature check entirely and\n  triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 Instance Metadata\n  Service (IMDS) at `169.254.169.254`.\n\n ### Impact\n\n  This is a Server-Side Request Forgery (SSRF) vulnerability. An attacker with a Hatchet account and an AWS Free Tier\n  account can:\n\n  - Reach the EC2 IMDS endpoint and retrieve IAM temporary credentials if Hatchet is deployed on AWS\n  - Port-scan and probe internal services not exposed to the internet\n  - Access internal HTTP APIs (e.g., Kubernetes API server, internal dashboards) from the Hatchet server's network\n  context","published":"2026-09-21T15:42:21.803Z","modified":"2026-10-21T02:58:52.292707130Z","cvss":{"score":4.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"hatchet-dev/hatchet","fixedVersion":"0.91.1"}],"fix":{"url":"https://github.com/hatchet-dev/hatchet/commit/2d211bce16e5022afaf95780de82dc30e0bcba98","label":"hatchet-dev/hatchet@2d211bc"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61681.json"},{"type":"ADVISORY","url":"https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-fjwv-jf2v-j499"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61681"},{"type":"FIX","url":"https://github.com/hatchet-dev/hatchet/commit/2d211bce16e5022afaf95780de82dc30e0bcba98"},{"type":"PACKAGE","url":"https://github.com/hatchet-dev/hatchet"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:58:52.292707130Z"}}