Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix for CVE-2026-46678 and CVE-2026-48782)
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.107.6, 2.44.0
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with force_download='allow-local' or web_fetch_tool with allow_local_urls=True can bypass the cloud-metadata blocklist by appending an IPv6 zone identifier to an IPv6 metadata address. IPv6Address equality and hashing include the zone identifier, so the blocklist comparison fails even though the network stack ignores the zone on a non-link-local destination and reaches the metadata service, potentially exposing cloud IAM credentials. The opt-in settings are disabled by default, and the issue requires an IPv6-enabled environment. This issue is fixed in versions 1.107.6 and 2.44.0.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- pydantic pydantic-ai
From 1.56.0 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0
- pydantic pydantic-ai-slim
From 1.56.0 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0
- pydantic-aiPyPI
From 1.56.0 · fixed in 1.107.6
- pydantic-aiPyPI
From 2.0.0b1 · fixed in 2.44.0
- pydantic-ai-slimPyPI
From 1.56.0 · fixed in 1.107.6
- pydantic-ai-slimPyPI
From 2.0.0b1 · fixed in 2.44.0
- pydantic-aiPyPI
From 1.56.0 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0
- pydantic-ai-slimPyPI
From 1.56.0 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0