Server-side request forgery in Helicone Jawn webhook sender
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Helicone through v2025.08.21-1 contains a server-side request forgery flaw in its Jawn webhook sender (CWE-918). An authenticated organization user with low privileges can create webhooks whose hostnames resolve, or DNS-rebind, to loopback or internal addresses. This causes blind POST requests to internal HTTPS services.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for helicone.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Vendor assessments
Timeline
- 2026-10-11 Threatist record created from CVE-2026-108602
- 2026-10-11 Alias added: GHSA-ch5j-5g34-4wwh
- 2026-10-18 CISA SSVC decision points changed
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Other 3
- 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/controllers/public/webhookController.ts#L64-L85
- https://github.com/Helicone/helicone
More Helicone vulnerabilities
- TI-2026-58511 Helicone Cross-Tenant Provider Key Disclosure via Missing Organization Filter CVSS 4.0HIGH 8.3
- TI-2026-13047 Helicone ai-gateway AWS Metadata Service service.rs build_target_url server-side request forgery CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-108602 · CVE Program
- CVE-2026-108602 · NVD
- FIRST EPSS
- GHSA-ch5j-5g34-4wwh · GitHub Advisory Database · CC BY 4.0
- CVE-2026-108602 · Red Hat security data · CC BY 4.0
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