CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-107294: Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.43% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: pydantic-ai (PyPI) 1.107.2, 2.24.0; pydantic-ai-slim (PyPI) 1.107.2, 2.24.0.

Low priority for now. Upgrade to pydantic-ai (PyPI) 1.107.2, 2.24.0; pydantic-ai-slim (PyPI) 1.107.2, 2.24.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.

Published: Oct 8, 2026
Updated: Oct 13, 2026
EPSS: 0.4% · 38th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 6.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
pydantic	pydantic ai	cpe:2.3:a:pydantic:pydantic_ai

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

pydantic pydantic-ai
- >= 1.77.0, < 1.107.2, >= 2.0.0b1, < 2.24.0affected
pydantic pydantic-ai-slim
- >= 1.77.0, < 1.107.2, >= 2.0.0b1, < 2.24.0affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

pydantic pydantic ai1.77.0 and later · before 1.107.2
pydantic pydantic ai2.0.0 and later · before 2.24.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
PyPI	pydantic-ai	from 1.77.0 · before 1.107.2	1.107.2
PyPI	pydantic-ai	from 2.0.0b1 · before 2.24.0	2.24.0
PyPI	pydantic-ai-slim	from 1.77.0 · before 1.107.2	1.107.2
PyPI	pydantic-ai-slim	from 2.0.0b1 · before 2.24.0	2.24.0

Same product

pydantic: all records

Other highest-scoring records for the same primary product.

CVE-2026-25580Pydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download Handling
34Monitor
CVE-2026-107295`pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution
30Monitor
CVE-2026-107286Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early
30Monitor

Published before and after this one in the same product

← EarlierCVE-2026-107291Oct 8, 2026 · Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`
9Monitor
← EarlierCVE-2026-107292Oct 8, 2026 · Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not validate the `Host` header
25Monitor
← EarlierCVE-2026-107293Oct 8, 2026 · Pydantic AI OpenTelemetry instrumentation: retry prompt content is not redacted when `include_content=False`
9Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
PyPI:pydantic-ai	1.107.2	Package registry (OSV)
PyPI:pydantic-ai	2.24.0	Package registry (OSV)
PyPI:pydantic-ai-slim	1.107.2	Package registry (OSV)
PyPI:pydantic-ai-slim	2.24.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedOct 8, 2026
Fix recordedOct 9, 2026same day
TodayNov 13, 2026+35 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-1072870 days apartPydantic AI: Excessive resource use when local web fetching converts nested HTML
26Monitor

Not on record for this CVE: researcher credit · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

SSVC exploitation— → noneOct 9, 2026, 5:07 PM UTC
Fix✗ → ✓Oct 9, 2026, 3:31 AM UTC
Exploit maturity— → noneOct 8, 2026, 9:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records