p PatchFirst

CVE-2026-55787

CVE-2026-55787 · Flyto2 Core: SSRF guard bypass via IPv6 transition addresses (IPv4-mapped / 6to4 / NAT64) in validate_url_ssrf

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.1 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • flyto-core

    Versions
    • < 2.26.3: Affected

    No fix published

  • flyto-core PyPI

    Versions
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.0.8
    • 1.0.9
    • 1.1.0
    • 1.1.1
    • 1.11.0
    • 1.12.0
    • 1.13.0
    • 1.14.0
    • 1.14.1
    • 1.14.2
    • 1.15.0
    • 1.16.0
    • 1.16.1
    • 1.16.10
    • 1.16.2
    • 1.16.3
    • 1.16.4
    • 1.16.5
    • 1.16.6
    • 1.16.7
    • 1.16.8
    • 1.16.9
    • 1.2.0
    • 1.3.0
    • 1.4.0
    • 1.5.0
    • 1.5.1
    • 1.5.2
    • 1.5.4
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.6.5
    • 1.7.0
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.7.4
    • 1.7.5
    • 1.7.6
    • 1.7.7
    • 1.7.8
    • 1.7.9
    • 1.8.0
    • 1.8.1
    • 1.8.10
    • 1.8.11
    • 1.8.12
    • 1.8.13
    • 1.8.14
    • 1.8.15
    • 1.8.16
    • 1.8.17
    • 1.8.2
    • 1.8.3
    • 1.8.4
    • 1.8.5
    • 1.8.6
    • 1.8.7
    • 1.8.8
    • 1.8.9
    • 1.9.0
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.1.0
    • 2.1.1
    • 2.1.2
    • 2.1.3
    • 2.1.4
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.12.1
    • 2.12.13
    • 2.12.15
    • 2.12.16
    • 2.12.17
    • 2.12.18
    • 2.12.19
    • 2.12.2
    • 2.12.20
    • 2.12.21
    • 2.12.22
    • 2.12.23
    • 2.12.24
    • 2.12.25
    • 2.12.26
    • 2.12.27
    • 2.12.28
    • 2.12.3
    • 2.12.4
    • 2.12.5
    • 2.12.6
    • 2.13.0
    • 2.13.1
    • 2.13.2
    • 2.13.3
    • 2.13.4
    • 2.14.0
    • 2.15.0
    • 2.15.1
    • 2.15.2
    • 2.15.3
    • 2.16.1
    • 2.16.3
    • 2.16.4
    • 2.17.0
    • 2.17.1
    • 2.17.2
    • 2.17.3
    • 2.17.4
    • 2.17.5
    • 2.17.6
    • 2.17.7
    • 2.17.8
    • 2.18.0
    • 2.18.1
    • 2.18.10
    • 2.18.11
    • 2.18.2
    • 2.18.3
    • 2.18.4
    • 2.18.5
    • 2.18.6
    • 2.18.8
    • 2.18.9
    • 2.19.0
    • 2.2.0
    • 2.2.1
    • 2.2.2
    • 2.20.0
    • 2.20.1
    • 2.20.2
    • 2.20.3
    • 2.20.4
    • 2.23.0
    • 2.23.1
    • 2.23.2
    • 2.23.3
    • 2.24.0
    • 2.24.1
    • 2.24.2
    • 2.24.3
    • 2.24.4
    • 2.25.0
    • 2.25.1
    • 2.25.10
    • 2.25.11
    • 2.25.12
    • 2.25.13
    • 2.25.14
    • 2.25.15
    • 2.25.16
    • 2.25.17
    • 2.25.18
    • 2.25.19
    • 2.25.2
    • 2.25.20
    • 2.25.21
    • 2.25.22
    • 2.25.23
    • 2.25.24
    • 2.25.25
    • 2.25.26
    • 2.25.27
    • 2.25.3
    • 2.25.4
    • 2.25.5
    • 2.25.6
    • 2.25.7
    • 2.25.8
    • 2.25.9
    • 2.26.0
    • 2.26.1
    • 2.26.2
    • 2.3.0
    • 2.3.1
    • 2.4.0
    • 2.4.1
    • 2.4.2
    • 2.4.3
    • 2.4.4
    • 2.4.5
    • 2.4.6
    • 2.4.7
    • 2.5.0
    • 2.5.1
    • 2.5.2
    • 2.6.0
    • 2.6.1
    • 2.7.0
    • 2.7.1
    • 2.7.2
    • 2.7.3
    • 2.7.4
    • 2.7.5
    • 2.7.6
    • 2.8.0
    • 2.9.0
    Affected ranges
    • ECOSYSTEM: < 2.26.3

    Update to 2.26.3

Original sources

Check your server →