# CVE-2026-108602: Helicone through v2025.08.21-1 SSRF via Jawn Webhook Sender DNS Resolution

> CVE-2026-108602: Helicone through v2025.08.21-1 SSRF via Jawn Webhook Sender DNS Resolution. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-108602
Last updated: 2026-10-18T12:16:57Z

- Published: 2026-10-10 19:54 UTC · Updated: 2026-10-18 12:16 UTC · Assigner: VulnCheck
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- EPSS: 0.21%, 12th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-918

## Description

Helicone through v2025.08.21-1 contains a server-side request forgery vulnerability in the Jawn webhook sender that allows authenticated organization users to reach internal services by using hostnames resolving to private addresses. Attackers can create webhooks with public hostnames that resolve or DNS-rebind to loopback or internal addresses, causing blind POST requests to internal HTTPS services.

## Affected vendors and products

- Helicone: helicone

## Tracked companies

- [Helicone](https://rewindex.com/company/helicone.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-108602)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-108602)
- [https://github.com/Helicone/helicone](https://github.com/Helicone/helicone)
- [https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/controllers/public/webhookController.ts\#L64-L85](https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/controllers/public/webhookController.ts#L64-L85)
- [https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/lib/clients/webhookSender.ts\#L11-L76](https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/lib/clients/webhookSender.ts#L11-L76)
- [https://hackmd.io/@haind/helicone-webhook-dns-ssrf](https://hackmd.io/@haind/helicone-webhook-dns-ssrf)
- [https://www.vulncheck.com/advisories/helicone-through-2025.08.21-1-ssrf-via-jawn-webhook-sender-dns-resolution](https://www.vulncheck.com/advisories/helicone-through-2025.08.21-1-ssrf-via-jawn-webhook-sender-dns-resolution)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-108602 · Markdown: https://rewindex.com/cve/CVE-2026-108602.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-108602 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:27.438Z