CVE-2026-107288
- Source
- https://cve.org/CVERecord?id=CVE-2026-107288
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107288.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-107288
- Aliases
-
- GHSA-22h6-qm39-v87j
- Published
- 2026-10-08T15:18:40Z
- Modified
- 2026-10-10T02:47:38Z
- Severity
-
- 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
- Summary
- Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently
- Details
-
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback compare blocked_domains entries with a URL hostname before both values are normalized to the form used by getaddrinfo. An attacker-influenced model can use an equivalent IDNA spelling, non-ASCII label separator, case variation, or trailing root label that resolves to a blocked host but does not match the configured string, causing the application to fetch that host with its own privileges. allowed_domains fails closed for unmatched spellings, and private-IP and cloud-metadata protections remain effective. This issue is fixed in versions 1.107.6 and 2.44.0.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-1289", "CWE-918" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107288.json" }- References
-
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107288.json
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j
- https://nvd.nist.gov/vuln/detail/CVE-2026-107288
- https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812
- https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284
- https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983
- https://github.com/pydantic/pydantic-ai/pull/8407
- https://github.com/pydantic/pydantic-ai/pull/8409
- https://github.com/pydantic/pydantic-ai/pull/8421
Affected packages
Git / github.com/pydantic/pydantic-ai
Affected ranges
- Type
- GIT
- Repo
- https://github.com/pydantic/pydantic-ai
- Events
-
IntroducedIntroducedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "1.77.0" }, { "fixed": "1.107.6" }, { "introduced": "2.0.0b1" }, { "fixed": "2.44.0" } ], "source": [ "AFFECTED_FIELD", "REFERENCES" ] }