Vulnerability · Published Jul 29, 2026 · Assigned by GitHub_M
CVE-2026-67426Flyto2 Core: Unauthenticated flyto-verification /run: callback_url SSRF and internal runner-secret exfiltration
Critical 9.3
In plain English
A critical-severity missing authentication in flyto-core from flytohub. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.7, the standalone flyto-verification service in src/core/verification_service.py exposes unauthenticated POST /run on 0.0.0.0:8344 and uses client-supplied callback_url for an outbound POST with X-Internal-Key: $FLYTO_RUNNER_SECRET while bypassing target_allowed, allowing unauthenticated SSRF and runner secret exfiltration. This issue is fixed in version 2.26.7.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | flyto-core | 2.26.7 | GHSA-jx74-cqjv-2c67 |
| PyPI | flyto-core | 2.26.7 | PYSEC-2026-3571 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| flytohub | flyto-core | < 2.26.7 |
Weakness: CWE-306, CWE-522, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N