CVE-2026-107286
- 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
- 2026-10-28T02:30:58Z
- 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
-
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.53.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107286.json
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-6fqq-452j-qhrp
- https://nvd.nist.gov/vuln/detail/CVE-2026-107286
- https://github.com/pydantic/pydantic-ai/commit/453f19feeb7ab1d789f9393b1723c6a73b3d77b2
- https://github.com/pydantic/pydantic-ai/pull/9478
Affected packages
Git / github.com/pydantic/pydantic-ai
Affected ranges
- Type
- GIT
- Repo
- https://github.com/pydantic/pydantic-ai
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*", "range": [ { "introduced": "2.10.0" }, { "fixed": "2.53.0" } ], "source": "CPE_RANGE" }, { "range": [ { "fixed": "453f19feeb7ab1d789f9393b1723c6a73b3d77b2" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v2.53.0", "range": [ { "fixed": "b38ab5d955394144296100d3c41599c003973722" } ], "source": "REFERENCES_TAG" } ] }