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Vulnerability details: VCID-efkn-13cf-97c3
Vulnerability ID VCID-efkn-13cf-97c3
Aliases CVE-2026-27129
GHSA-v2gc-rm6g-wrw9
Summary Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution The SSRF validation in Craft CMS’s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437 ([GHSA-x27p-wfqw-hfcc](https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc)).
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-918 Server-Side Request Forgery (SSRF)
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2026-27129
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-v2gc-rm6g-wrw9
cvssv4 5.5 https://github.com/craftcms/cms
generic_textual MODERATE https://github.com/craftcms/cms
cvssv4 5.5 https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
cvssv4 5.7 https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
generic_textual MODERATE https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
ssvc Track https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
cvssv3.1_qr MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
cvssv4 5.5 https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
cvssv4 5.7 https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
generic_textual MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
ssvc Track https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
cvssv4 5.5 https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
cvssv4 5.7 https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
generic_textual MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
ssvc Track https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
cvssv4 5.5 https://nvd.nist.gov/vuln/detail/CVE-2026-27129
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-27129
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-27129
https://github.com/craftcms/cms
https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
CVE-2026-27129 https://nvd.nist.gov/vuln/detail/CVE-2026-27129
GHSA-v2gc-rm6g-wrw9 https://github.com/advisories/GHSA-v2gc-rm6g-wrw9
GHSA-v2gc-rm6g-wrw9 https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
GHSA-x27p-wfqw-hfcc https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:16:52Z/ Found at https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:16:52Z/ Found at https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:16:52Z/ Found at https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27129
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.01554
EPSS Score 0.00011
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T21:06:50.675132+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/craftcms/cms/CVE-2026-27129.yml 38.6.0