{"cve":{"cve_id":"CVE-2026-48782","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00332,"epss_percentile":0.24817,"epss_as_of":"2026-06-23","description":"Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. In versions 1.56.0 through 1.101.0, 2.0.0b1, and 2.0.0b2, the cloud-metadata blocklist could be bypassed by encoding the metadata IP in an IPv6 transition form that the previous fix, CVE-2026-46678, did not decode, exposing cloud IAM short-term credentials. The previous remediation decoded only IPv4-mapped IPv6, 6to4, and the NAT64 well-known prefix, so the metadata guarantee did not hold for the remaining transition forms: IPv4-compatible IPv6 (::a.b.c.d), the NAT64 RFC 8215 local-use prefix (64:ff9b:1::/48), operator-chosen NAT64 prefixes, and ISATAP. The IPv6 wrapper is then delivered to the underlying IPv4 metadata endpoint. This occurs when an application using Pydantic AI opts a URL into force_download='allow-local' (which disables the default block on private/internal IPs) and runs on a network that actually routes the affected IPv6 transition forms: NAT64-configured networks (IPv6-only or dual-stack-with-NAT64 deployments, including some Kubernetes setups) for the NAT64 variants, or networks with an ISATAP tunnel for ISATAP. A standard dual-stack cloud VM or container does not route these forms and is not affected in practice. The IPv4-compatible and Teredo variants are deprecated and addressed as defense-in-depth. This is an incomplete fix of GHSA-cqp8-fcvh-x7r3 / CVE-2026-46678 (itself a follow-up to CVE-2026-25580). This issue has been fixed in version 2.0.0b3.","published_at":"2026-06-16T22:49:26.750000Z","last_modified_at":null,"cvss_v3_score":6.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-918"],"nvd_references":["https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-cg7w-rg45-pc59","https://github.com/pydantic/pydantic-ai/pull/5596","https://github.com/pydantic/pydantic-ai/commit/1add06179ba4de259f7ab977620b697b7209f7e4","https://github.com/pydantic/pydantic-ai/releases/tag/v1.102.0"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:44.057552Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"pydantic","vendor_name":"pydantic","product_slug":"pydantic-ai","product_name":"pydantic-ai","version_start":">= 1.56.0, < 1.102.0","version_start_inclusive":true,"version_end":">= 1.56.0, < 1.102.0","version_end_inclusive":true,"cpe23_uri":"cve5:pydantic:pydantic-ai:>= 1.56.0, < 1.102.0:>= 1.56.0, < 1.102.0"},{"vendor_slug":"pydantic","vendor_name":"pydantic","product_slug":"pydantic-ai","product_name":"pydantic-ai","version_start":">= 2.0.0b1, < 2.0.0b3","version_start_inclusive":true,"version_end":">= 2.0.0b1, < 2.0.0b3","version_end_inclusive":true,"cpe23_uri":"cve5:pydantic:pydantic-ai:>= 2.0.0b1, < 2.0.0b3:>= 2.0.0b1, < 2.0.0b3"},{"vendor_slug":"pydantic","vendor_name":"pydantic","product_slug":"pydantic-ai-slim","product_name":"pydantic-ai-slim","version_start":">= 2.0.0b1, < 2.0.0b3","version_start_inclusive":true,"version_end":">= 2.0.0b1, < 2.0.0b3","version_end_inclusive":true,"cpe23_uri":"cve5:pydantic:pydantic-ai-slim:>= 2.0.0b1, < 2.0.0b3:>= 2.0.0b1, < 2.0.0b3"},{"vendor_slug":"pydantic","vendor_name":"pydantic","product_slug":"pydantic-ai-slim","product_name":"pydantic-ai-slim","version_start":">= 1.56.0, < 1.102.0","version_start_inclusive":true,"version_end":">= 1.56.0, < 1.102.0","version_end_inclusive":true,"cpe23_uri":"cve5:pydantic:pydantic-ai-slim:>= 1.56.0, < 1.102.0:>= 1.56.0, < 1.102.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-cg7w-rg45-pc59","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/pydantic/pydantic-ai/pull/5596","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/pydantic/pydantic-ai/commit/1add06179ba4de259f7ab977620b697b7209f7e4","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/pydantic/pydantic-ai/releases/tag/v1.102.0","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-16T22:49:26.750000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:55:03.830140Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:03.830140Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:03.830140Z","label":"CVSS score revised","source":"cvelistv5"}]}