CVE-2026-46678Network attack vectorHinoki check available

Cloud credential disclosure via IPv6 blocklist bypass

Published Jul 29, 2026 · Updated Jul 29, 2026

SSRF in Pydantic AI and Pydantic AI Slim 1.56.0 through 1.98.0 allows remote attackers to read cloud IAM credentials. The URL validator fails to normalize IPv4-mapped IPv6, 6to4, and NAT64 forms before comparing resolved destinations with the cloud-metadata blocklist. Exploitation requires an untrusted FileUrl explicitly marked force_download='allow-local' and a dual-stack or translated network that routes the encoded address.

CVSS severity6.8
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Pydantic AI and Pydantic AI Slim 1.56.0 through 1.98.0 allows remote attackers to read cloud IAM credentials. The URL validator fails to normalize IPv4-mapped IPv6, 6to4, and NAT64 forms before comparing resolved destinations with the cloud-metadata blocklist. Exploitation requires an untrusted FileUrl explicitly marked force_download='allow-local' and a dual-stack or translated network that routes the encoded address.

The record

CVE
CVE-2026-46678
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Pydantic
Product
Pydantic AI Slim
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.56.0, < 1.99.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pydantic · Pydantic AI Slimversion=>= 1.56.0, < 1.99.0
Pydantic · Pydantic AIversion=>= 1.56.0, < 1.99.0

Published CVSS scores

5.9NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
6.8GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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