CVE-2026-55787
Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.3, validate_url_ssrf and is_private_ip in src/core/utils.py compare resolved addresses only against native private IPv4 and IPv6 ranges and do not unwrap IPv4-mapped, IPv4-compatible, 6to4, or NAT64 transition addresses. An authenticated workflow author can provide a transition-form literal URL through the Execution API POST /v1/execute route, http.get, or sibling guarded outbound-request modules, causing the guard to accept an address whose embedded IPv4 points to loopback, RFC 1918, or cloud metadata services. On a host that routes the selected transition form, the outbound request reaches the internal destination and returns the response body to the workflow caller, enabling read SSRF and disclosure of internal-service data or cloud credentials. This issue is fixed in version 2.26.3.
- CVSS 3.1
- 7.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-25)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-794r-5rp2-fpg8 | PyPI | flyto-core | <2.26.3 | 2.26.3 |
| PYSEC-2026-2481 | PyPI | flyto-core | <2.26.3 | 2.26.3 |
References
- https://github.com/flytohub/flyto-core/commit/519e040384a74984848c4e84a6600e5f1020a6d2
- https://github.com/flytohub/flyto-core/pull/20
- https://github.com/flytohub/flyto-core/releases/tag/v2.26.3
- https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8
- https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8