CVE-2026-46678

Description

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

Overview

State

—

Assigner (CNA)

—

CVSS severity

medium

CVSS score

6.8 / 10

CVSS vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Effective score

6.8 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-46678

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-50561

Assigner

GitHub_M

Published

Jul 29, 2026, 8:16:45 PM

Updated

Jul 30, 2026, 2:37:27 PM

EUVD base score (CVSS 3.1)

6.8 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

EUVD-reported EPSS

0.4200

Vendors

Pydantic

Products

pydantic-ai (1.56.0, < 1.99.0)

pydantic-ai-slim (1.56.0, < 1.99.0)

Aliases

GHSA-cqp8-fcvh-x7r3, PYSEC-2026-2978, PYSEC-2026-2982

ENISA description: Pydantic AI is a Python agent framework for building Generative AI applications. In versions 1.56.0 through 1.98.0, when an application opts a URL into force_download='allow-local' (disabling the default block on private/internal IPs), the cloud-metadata blocklist could be bypassed by encoding the metadata IP in an IPv6 transition form (IPv4-mapped IPv6, 6to4, or NAT64), exposing cloud IAM short-term credentials on dual-stack or translated networks. This is an incomplete fix of GHSA-2jrp-274c-jhv3 / CVE-2026-25580, whose remediation did not hold for IPv6-encoded forms of the metadata IPs. An application is affected only if it explicitly opts a FileUrl (ImageUrl, AudioUrl, VideoUrl, DocumentUrl) into force_download='allow-local' on a URL influenced by untrusted input; it is not affected when using bundled integrations to ingest user input (Agent.to_web / clai web, VercelAIAdapter, AGUIAdapter / Agent.to_ag_ui), since they do not propagate force_download from external data, nor when downloading only from developer-controlled URLs. This issue has been fixed in version 1.99.0.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (2)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2026-46678 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-46678 tenable:www.cve.org

• Security Advisory Bulletin 064 | Ubiquiti Community
  web:community.ui.com

  Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

  2026-05-26 03:09 UTC
• CVE-2026-46678 - MEDIUM Severity Vulnerability | CVEInfo.com
  web:cveinfo.com

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

  2026-05-26 03:09 UTC
• CISA Warns of Exploited Microsoft Defender 0-Day Flaws
  web:cyberpress.org

  The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

  2026-05-26 03:09 UTC
• CVE-2026-46678 - Exploits & Severity - Feedly
  web:feedly.com

  Patch Mitigation <p>Upgrade to <code>1.99.0</code> or later. The cloud-metadata and private-IP blocklists now apply to IPv6 transition forms that route to a blocked IPv4 endpoint (IPv4-mapped IPv6, 6to4, and NAT64 well-known prefix). The blocklists have also been extended to cover additional IANA-reserved IPv4 and IPv6 special-purpose ranges.</p>

  2026-05-26 03:09 UTC
• About the security content of iOS 26.4 and iPadOS 26.4
  web:support.apple.com

  This document describes the security content of iOS 26.4 and iPadOS 26.4.

  2026-05-26 03:09 UTC
• Addressing Exchange Server May 2026 vulnerability CVE-2026-42897
  web:techcommunity.microsoft.com

  We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE - 2026 -42897.

  2026-05-26 03:09 UTC
• A guide to vulnerability remediation vs mitigation | @Bugcrowd
  web:www.bugcrowd.com

  Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

  2026-05-26 03:09 UTC
• CVE: Common Vulnerabilities and Exposures
  web:www.cve.org

  At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

  2026-05-26 03:09 UTC
• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-05-26 03:09 UTC
• Patch Tuesday May 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-05-26 03:09 UTC

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