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PYSEC-2026-2978 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)

🗓️ 13 Jul 2026 15:19:11Reported by GoogleType 
osv
 osv🔗 osv.dev👁 3 Views

Summary When an application using Pydantic AI opts a URL into force_download='allow-local' (which disables the default block on private/internal IPs), the cloud-metadata blocklist could be bypassed by encoding the metadata IP in an IPv6 transition...

Related
Refs
ReporterTitlePublishedViews
Family
Circl		CVE-2026-46678
17 Jun 202600:18
–circl
CVE		CVE-2026-46678
21 May 202621:35
–cve
EUVD		EUVD-2026-37512
26 Jun 202619:17
–euvd
Github Security Blog		pydantic-ai: SSRF blocklist bypass via IPv4-compatible, SIIT/IVI, and local NAT64 IPv6 addresses (incomplete fix of CVE-2026-46678)
26 Jun 202619:17
–github
Github Security Blog		Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
21 May 202621:35
–github
Github Security Blog		pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs
9 Jul 202613:35
–github
OSV		GHSA-CQP8-FCVH-X7R3 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
21 May 202621:35
–osv
OSV		PYSEC-2026-2982 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
13 Jul 202615:19
–osv
OSV		ROOT-APP-PYPI-CVE-2026-46678 CVE-2026-46678 in rootio-pydantic-ai-slim - Patched by Root
23 Jun 202611:18
–osv
Positive Technologies		PT-2026-42698
21 May 202600:00
–ptsecurity
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13 Jul 2026 16:43Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.16.8
EPSS0.00039
3