GHSA-2jrp-274c-jhv3: pydantic-ai (CVE-2026-25580)

Package	Ecosystem	Affected	Fixed in
pydantic-ai	PyPI	>=0.0.26, <1.56.0	1.56.0
pydantic-ai-slim	PyPI	>=0.0.26, <1.56.0	1.56.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Pydantic AI (pydantic-ai and pydantic-ai-slim) versions from 0.0.26 before 1.56.0 are vulnerable to server-side request forgery in URL download handling. An attacker who can supply message history, such as through the web chat interface, Vercel AI or AG-UI adapters, or a custom API, can make the server fetch internal or cloud metadata URLs. Upgrade to version 1.56.0 or later, which blocks private addresses by default and always blocks cloud metadata endpoints.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.6	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0065, the 51st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:01 UTC First seen by agentprime
31 Oct 2026, 15:01 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.