Flyto2 Core: SSRF guard bypass via IPv6 transition addresses (IPv4-mapped / 6to4 / NAT64) in validate_url_ssrf
CVSS score
7.1
EPSS probability
—
Risk score
0.7
Published
11 h ago
Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
3
Source agreement
Tam uyum
Evidence confidence
%71
Short explanation
In Flyto2 Core prior to 2.26.3, validate_url_ssrf and is_private_ip in src/core/utils.py fail to unwrap IPv6 transition addresses when checking local IP ranges, allowing an SSRF guard bypass. An authenticated workflow author can exploit this to access internal services or cloud metadata services.
This vulnerability allows attackers to access internal service data or cloud credentials. Sensitive data can be exposed through read SSRF.
What should be done?
- Upgrade Flyto2 Core to version 2.26.3 or above.
- Follow vendor security advisories.
Chain of evidence and sources
Flyto2 Core 2.26.3 öncesi sürümlerde, is_private_ip ve validate_url_ssrf fonksiyonları IPv6 geçiş adreslerini açmaz.
Kimliği doğrulanmış bir iş akışı yazarı Execution API POST /v1/execute rotası ile istek gönderebilir.
Bu zafiyet 2.26.3 sürümünde giderilmiştir.
Show the technical text from the sources
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 vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
CWE: CWE-918, CWE-937, CWE-1035
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.1 | CVSS V31 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N | NVD |
| 7.1 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
2.26.3GitLab Advisory düzeltilmiş sürüm: 2.26.3
Upgrade to version 2.26.3 or above.
Upgrade to version 2.26.3 or above.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-55787 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-55787 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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