CVE-2026-107288

{"id": "CVE-2026-107288", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-107288", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-08T17:28:31.014859Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.2}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "pydantic", "product": "pydantic-ai", "versions": [{"status": "affected", "version": ">= 1.77.0, < 1.107.6"}, {"status": "affected", "version": ">= 2.0.0b1, < 2.44.0"}]}, {"vendor": "pydantic", "product": "pydantic-ai-slim", "versions": [{"status": "affected", "version": ">= 1.77.0, < 1.107.6"}, {"status": "affected", "version": ">= 2.0.0b1, < 2.44.0"}]}]}], "published": "2026-10-08T16:17:04.147", "references": [{"url": "https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/pull/8407", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/pull/8409", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/pull/8421", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6", "tags": ["Patch", "Release Notes", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0", "tags": ["Patch", "Release Notes", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-918"}, {"lang": "en", "value": "CWE-1289"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-10-13T14:35:05.370", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "B5355402-6E86-4212-A795-993C09433A3C", "versionEndExcluding": "1.107.6", "versionStartIncluding": "1.77.0"}, {"criteria": "cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "7FEC7EC8-5520-4930-8853-83108092F8BF", "versionEndExcluding": "2.44.0", "versionStartIncluding": "2.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}