CVE-2026-55787

See a problem?
Please try reporting it to the source first.

Source

https://cve.org/CVERecord?id=CVE-2026-55787

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55787.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55787

Aliases

Published

2026-10-14T18:13:52Z

Modified

2026-10-15T10:47:32Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N CVSS Calculator

Summary

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

Details

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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55787.json"
}

References

Affected packages

Git / github.com/flytohub/flyto-core

Affected ranges

Type

GIT

Repo

https://github.com/flytohub/flyto-core

Events

Introduced

Fixed

e8c6fd9902ff93389cd2e3ecaa472b7d91aec67e

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.26.3"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v2.*

v2.16.3

v2.17.6

v2.2.2

v2.25.27

v2.26.0

v2.5.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55787.json"