CVE-2026-25580 Pydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download Handling
Attackers can exploit SSRF in Pydantic AI's URL download handling to access internal network resources or cloud credentials when accepting untrusted message history.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25580?
CVE-2026-25580 is a high-severity server-side request forgery vulnerability in pydantic-ai, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.0.26 to before 1.56.0, aServer-Side Request Forgery (SSRF) vulnerability exists in Pydantic AI's URL download functionality. When applications accept message history from untrusted sources, attackers can include malicious URLs that cause the server to make HTTP requests to internal network resources, potentially accessing internal services or cloud credentials. This vulnerability only affects applications that accept message history from external users. This vulnerability is fixed in 1.56.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-25580?
6 open source packages ship an affected version, including pydantic-ai and pydantic-ai-slim. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pydantic-ai PyPI | From 0.0.26 | 1.56.0 |
pydantic-ai PyPI | From 0.0.26 | 1.56.0 |
pydantic-ai PyPI | From 0.0.26 | 1.56.0 |
pydantic-ai-slim PyPI | From 0.0.26 | 1.56.0 |
pydantic-ai-slim PyPI | From 0.0.26 | 1.56.0 |
pydantic-ai-slim PyPI | From 0.0.26 | 1.56.0 |
Products include Pydantic Pydantic Ai.
How do I fix CVE-2026-25580?
Upgrade pydantic-ai to 1.56.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-25580 being exploited?
There is no known exploitation of CVE-2026-25580 in the wild and no public exploit code.
Other vulnerabilities in pydantic-ai
- CVE-2026-107295 Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): a website visited by the developer can trigger agent runs and server-side tool execution on the local chat endpoint
- CVE-2026-107286 Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early
- CVE-2026-25640 Pydantic AI affected by Stored XSS via Path Traversal in Web UI CDN URL
- CVE-2026-107289 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers
- CVE-2026-46678 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
Sources
Also known as GHSA-2jrp-274c-jhv3, PYSEC-2026-2976, PYSEC-2026-2980.