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Response snapshot Nov 5, 2026, 01:01 UTC

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VulnerabilityCVE-2026-61681

Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

The SNS UnsubscribeConfirmation handler in internal/integrations/ingestors/sns/sns.go makes an unvalidated http.Get() call to payload.UnsubscribeURL without any URL restriction.

At a glance

Exploited
Not known
Severity
4.1 Medium (CVSS 3.1)
Chance of exploitation
0.3% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: github.com/hatchet-dev/hatchet: 0.91.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-fjwv-jf2v-j499 (opens a new tab)

What happened

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

Continue reading

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

Affected package ranges reported by GitHub: github.com/hatchet-dev/hatchet: < 0.91.1

Scores and how they were measured

CVSS base severity

4.1

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.3%

Scored Percentile 24.1%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-fjwv-jf2v-j499 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-fjwv-jf2v-j499, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-61681, scored 2026-11-04. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 4). Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler (CVE-2026-61681). https://kevwire.com/record/CVE-2026-61681

MLA

"Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler (CVE-2026-61681)." KEVWire, 4 Nov. 2026, kevwire.com/record/CVE-2026-61681.

Chicago

KEVWire. "Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler (CVE-2026-61681)." Last modified November 4, 2026. https://kevwire.com/record/CVE-2026-61681.

Evidence summary (plain text)

Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler (Sep 22, 2026).
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.
CVSS 4.1 (version 3.1; evidence as of Nov 4, 2026; https://github.com/advisories/GHSA-fjwv-jf2v-j499).
EPSS 0.3% for the following 30 days, scored Nov 4, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-61681&date=2026-11-04).
Sources:
GitHub-reviewed advisory GHSA-fjwv-jf2v-j499: https://github.com/advisories/GHSA-fjwv-jf2v-j499
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-61681&date=2026-11-04
Record ID: CVE-2026-61681.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 5, 2026, 00:26 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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