CVE-2026-55787

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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
2026-10-28T02:30:50Z
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
0 Unknown introduced commit / All previous commits are affected
Fixed
e8c6fd9902ff93389cd2e3ecaa472b7d91aec67e
Fixed
519e040384a74984848c4e84a6600e5f1020a6d2
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "2.26.3"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "519e040384a74984848c4e84a6600e5f1020a6d2"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v2.26.3",
            "range": [
                {
                    "fixed": "e8c6fd9902ff93389cd2e3ecaa472b7d91aec67e"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

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"