Flyto2 Core: Unauthenticated flyto-verification /run: callback_url SSRF and internal runner-secret exfiltration
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass, Information disclosure
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306 and CWE-522.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| flytohub | flyto-core | before 2.26.7 | 2.26.7 | Patch available | CNA |
| — | flyto-core (PyPI) | 2.26.6 to before 2.26.7 | 2.26.7 | Patch available | GHSA-jx74-cqjv-2c67 |
- flyto-core Vendorflytohub Affected before 2.26.7 Fixed in 2.26.7 Patch available CNA
- flyto-core (PyPI) Vendor— Affected 2.26.6 to before 2.26.7 Fixed in 2.26.7 Patch available GHSA-jx74-cqjv-2c67
Remediation
- Fix · CNA flyto-core (flytohub) Fixed in 2.26.7
- Fix · GHSA-jx74-cqjv-2c67 flyto-core (PyPI) Fixed in 2.26.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-67426
- 2026-10-03 Alias added: GHSA-jx74-cqjv-2c67
References
Other 5
- https://github.com/flytohub/flyto-core/security/advisories/GHSA-jx74-cqjv-2c67
- https://github.com/flytohub/flyto-core/commit/0a0a528520ec18f5a21f1ddf858a71cc1edfb6e9
- https://github.com/flytohub/flyto-core/releases/tag/v2.26.7
- https://github.com/flytohub/flyto-core
- https://github.com/pypa/advisory-database/tree/main/vulns/flyto-core/PYSEC-2026-3571.yaml
More flytohub vulnerabilities
- TI-2026-47709 Flyto2 Core: Arbitrary file write via image.download (and other file-writing modules) CVSS 3.1CRITICAL 10.0
- TI-2026-47707 Flyto2 Core: ${env.VAR} interpolation reads any env secret despite env.get being denylisted CVSS 3.1HIGH 8.6
- TI-2026-47705 Flyto2 Core: LLM/API keys leak to an attacker-controlled base_url CVSS 3.1HIGH 8.6
- TI-2026-74172 Unauthenticated command execution in Flyto2 Core over HTTP MCP CVSS 3.1HIGH 8.4
- TI-2026-47708 Server-side request forgery in flytohub flyto-core CVSS 3.1HIGH 8.5
- TI-2026-47704 Flyto2 Core: Guarded HTTP modules follow redirects into internal space without per-hop SSRF revalidation CVSS 3.1HIGH 8.5
Sources
- CVE-2026-67426 · CVE Program
- CVE-2026-67426 · NVD
- FIRST EPSS
- GHSA-jx74-cqjv-2c67 · GitHub Advisory Database · CC BY 4.0
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