CVE-2026-107286: Pydantic AI is a Python agent framework for building applications and workflows with Generative AI

Q: How do I fix CVE-2026-107286?

pydantic ai: upgrade to 2.53.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-107286 being exploited?

CVE-2026-107286 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-107286 affect?

CVE-2026-107286 affects pydantic ai. Severity is high (CVSS 7.5). Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limit_model_concurrency can retain shared concurrency sl

Q: How urgent is CVE-2026-107286?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-107286 is a high-severity flaw (CVSS 7.5) affecting pydantic ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limit_model_concurrency can retain shared concurrency slots because anyio.CapacityLimiter associates an acquired slot with the borrowing task while streaming cleanup can run in a different task. Early stream termination, cancellation, consumer exceptions, or complet

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-772
Published	2026-10-08
Last modified	2026-10-13

Publisher (CNA): GitHub, Inc. · Vendor: pydantic

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-08 15:17 UTCPublished CVE record published
2026-10-13 14:36 UTCUpdated Record last modified

pydantic pydantic ai UPGRADE

Affected: >= 2.10.0 and < 2.53.0

Fixed in: 2.53.0

Safe to downgrade to: a release before 2.10.0

1. Check installed version

pip show pydantic-ai

2. UPGRADE to 2.53.0

pip install --upgrade "pydantic-ai>=2.53.0"

3. If no update is available yet, DOWNGRADE to a release before 2.10.0

pip index versions pydantic-ai pip install "pydantic-ai<2.10.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-107286?

pydantic ai: upgrade to 2.53.0. Exact commands for each OS are on this page.

Is CVE-2026-107286 being exploited?

CVE-2026-107286 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-107286 affect?

CVE-2026-107286 affects pydantic ai. Severity is high (CVSS 7.5). Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limit_model_concurrency can retain shared concurrency sl

How urgent is CVE-2026-107286?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-107292 MEDIUM 6.4 UPGRADE Pydantic AI is a Python agent framework for building applications and workflows with Generative AI
CVE-2026-107287 MEDIUM 6.5 UPGRADE Pydantic AI is a Python agent framework for building applications and workflows with Generative AI
CVE-2026-107288 LOW 3.7 UPGRADE Pydantic AI is a Python agent framework for building applications and workflows with Generative AI
CVE-2026-107289 MEDIUM 6.8 UPGRADE Pydantic AI is a Python agent framework for building applications and workflows with Generative AI
CVE-2026-107290 MEDIUM 6.5 UPGRADE Pydantic AI is a Python agent framework for building applications and workflows with Generative AI

References

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