Vulnerability · Published Oct 10, 2026 · Assigned by VulnCheck

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

Medium 4.3

In plain English

A medium-severity server-side request forgery in helicone from Helicone. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 88.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
Helicone	helicone	0 – through v2025.08.21-1

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://hackmd.io/@haind/helicone-webhook-dns-ssrf third-party-advisory
https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/lib/clients/webhookSender.ts#L11-L76 technical-description
https://github.com/Helicone/helicone/blob/067d9290acb4f1fc9320e902fc67b4b399b50363/valhalla/jawn/src/controllers/public/webhookController.ts#L64-L85 technical-description
https://github.com/Helicone/helicone product
VulnCheck Advisory: Helicone through v2025.08.21-1 SSRF via Jawn Webhook Sender DNS Resolution third-party-advisory