CVE-2026-107286

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Source
https://cve.org/CVERecord?id=CVE-2026-107286
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107286.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-107286
Aliases
Published
2026-10-08T15:12:26Z
Modified
2026-10-09T02:52:04Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early
Details

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 complete stream_text() consumption with debounce_by=0.1 can therefore leave capacity occupied, eventually preventing later requests that share the long-lived limiter from proceeding and causing a denial of service. Agent-level max_concurrency and non-streaming model requests are not affected. This issue is fixed in version 2.53.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-772"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107286.json"
}
References

Affected packages

Git / github.com/pydantic/pydantic-ai

Affected ranges

Type
GIT
Repo
https://github.com/pydantic/pydantic-ai
Events
Introduced
d8b95a48466e99963042d2bd3164c6fdc227e6d4
Fixed
b38ab5d955394144296100d3c41599c003973722
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.10.0"
        },
        {
            "fixed": "2.53.0"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

v2.*
v2.10.0
v2.11.0
v2.12.0
v2.13.0
v2.14.0
v2.14.1
v2.15.0
v2.16.0
v2.17.0
v2.18.0
v2.19.0
v2.20.0
v2.21.0
v2.22.0
v2.23.0
v2.24.0
v2.25.0
v2.26.0
v2.27.0
v2.27.1
v2.28.0
v2.29.0
v2.30.0
v2.31.0
v2.31.1
v2.32.0
v2.32.1
v2.32.2
v2.33.0
v2.34.0
v2.35.0
v2.35.1
v2.35.3
v2.36.0
v2.37.0
v2.38.0
v2.39.0
v2.40.0
v2.41.0
v2.42.0
v2.43.0
v2.44.0
v2.45.0
v2.46.0
v2.47.0
v2.48.0
v2.49.0
v2.50.0
v2.51.0
v2.52.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107286.json"