SSRF in Helicone
CVE-2026-108602
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind/helicone-webhook-dns-ssrf (third-party-advisory)
- github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valh… (technical-description)
- github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valh… (technical-description)
- github.com/Helicone/helicone (product)
- www.vulncheck.com/advisories/helicone-through-2025.08.21-1-ssrf-via-jawn-webhoo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108602?
- CVE-2026-108602 is a medium-severity vulnerability in Helicone, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-10-10.
- How severe is CVE-2026-108602?
- Medium severity. CVSS v3 base score is 4.3 out of 10.