Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler
### Summary The SNS `UnsubscribeConfirmation` handler in `internal/integrations/ingestors/sns/sns.go` makes an unvalidated `http.Get()` call to `payload.UnsubscribeURL` without any URL restriction. Because `UnsubscribeURL` is intentionally excluded from the `BuildSignature()` signed field list, an attacker can replace this field in a legitimately AWS-signed message with an arbitrary internal URL, bypassing the `VerifyPayload()` signature check entirely and triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 Instance Metadata Service (IMDS) at `169.254.169.254`. ### Impact This is a Server-Side Request Forgery (SSRF) vulnerability. An attacker with a Hatchet account and an AWS Free Tier account can: - Reach the EC2 IMDS endpoint and retrieve IAM temporary credentials if Hatchet is deployed on AWS - Port-scan and probe internal services not exposed to the internet - Access internal HTTP APIs (e.g., Kubernetes API server, internal dashboards) from the Hatchet server's network context
GHSA-fjwv-jf2v-j499
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GHSA-fjwv-jf2v-j499
hatchet-dev/hatchet
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 0.91.1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.91.1"
}
]
}
],
"package": {
"name": "hatchet-dev/hatchet",
"purl": "pkg:golang/hatchet-dev/hatchet",
"ecosystem": "Go"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-fjwv-jf2v-j499/GHSA-fjwv-jf2v-j499.json"
}
}
]- Related CVEs
- CVE-2026-61681
Source reference:
/aliases
Publisher severity
No explicit severity was provided.
- Event
- #63876 · Revision 1
- Added to Heist Feed
- Publisher date