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01 Record

CVE-2026-107288

Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently

LowPUBLISHEDCNA: GitHub_M
CNA base score3.7 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
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02 Description

Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.36% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 30.4% of scored records. A rank, not a probability.
NVD base score
3.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-13.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-08 15:18Z20 DAYS AGO
Last updated
2026-10-08 17:28Z20 DAYS AGO
Reserved
2026-10-07
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Low (CVSS 3.7)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
  • CWE-918Server-Side Request Forgery (SSRF)Base
  • CWE-1289Improper Validation of Unsafe Equivalence in InputBase
Data version
5.2
Document digest
fb4796c7c1770e624ac8ee3c2c4269c050a40d6444cf73bc6eecdcd04ee9f8f9

05 Affected products

VendorProductVersionsPlatforms
pydanticpydantic-ai>= 1.77.0, < 1.107.6, >= 2.0.0b1, < 2.44.0—
pydanticpydantic-ai-slim>= 1.77.0, < 1.107.6, >= 2.0.0b1, < 2.44.0—

06 References