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Vulnerabilities

Vulnerability · CVE-2026-61681

Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

Published Sep 22, 2026 · catalog updated Nov 4, 2026 · Hatchet: SSRF via Unsigned

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-61681. EPSS is 0.31%. Act only if a listed version of Hatchet: SSRF via Unsigned is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Hatchet: SSRF via Unsigned).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Version ranges on file
Affected products
Go github.com/hatchet-dev/hatchet · go github.com/hatchet-dev/hatchet

### Summary The SNS handler in makes an unvalidated call to without any URL restriction. Because is intentionally excluded from the signed field list, an attacker can replace this field in a legitimately AWS-signed message with an arbitrary internal URL, bypassing the signature check entirely and triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 Instance Metadata Service (IMDS) at . ### 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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go github.com/hatchet-dev/hatchet0 → 0.91.1
  • go github.com/hatchet-dev/hatchet<0.91.1

How to fix CVE-2026-61681

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-61681. EPSS is 0.31%. Act only if a listed version of Hatchet: SSRF via Unsigned is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.91.1, <0.91.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 22, 2026 · GitHub Advisory Database

    Detected

    ### Summary The SNS handler in makes an unvalidated call to without any URL restriction. Because is intentionally excluded from the signed field list, an attacker can replace this field in a legitimately AWS-signed message with an arbitrary internal URL, bypassing the signature check entirely and triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 In

  2. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/hatchet-dev/hatchet fixed in 0.91.1

  3. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/hatchet-dev/hatchet fixed in 0.91.1

  4. Nov 4, 2026 · GitHub Advisory Database

    Updated

    ### Summary The SNS handler in makes an unvalidated call to without any URL restriction. Because is intentionally excluded from the signed field list, an attacker can replace this field in a legitimately AWS-signed message with an arbitrary internal URL, bypassing the signature check entirely and triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 In

Sources

  • CVE.orgVulnerability recordCVE-2026-61681

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-fjwv-jf2v-j499

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • GitLab Advisory DatabasePackage advisorygo/github.com/hatchet-dev/hatchet/CVE-2026-61681.yml

    The SNS handler in + makes an unvalidated\n call to without any + URL restriction. Because is intentionally\nexcluded from the + signed field list, an attacker can replace this field in a legitimately\nAWS-signed + message with an arbitrary internal URL, bypassing the signature + check entirely and\ntriggering a Server-Side Request

    gitlab.com
  • Go Vulnerability DatabasePackage advisoryGHSA-fjwv-jf2v-j499

    Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

    osv.dev
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-fjwv-jf2v-j499

    Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

    osv.dev

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 5, 2026
  • Go Vulnerability DatabaseNov 5, 2026
  • GitLab Advisory DatabaseNov 5, 2026
  • GitHub Advisory DatabaseNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 5, 2026