{"answers":{"affected":"10 open source packages ship an affected version, including pydantic-ai and pydantic-ai-slim. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-107290 in the wild and no public exploit code.","fix":"Upgrade pydantic-ai to a fixed version for your release line: 1.107.6 or 2.44.0.","what":"CVE-2026-107290 is a medium-severity denial of service vulnerability in pydantic-ai, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-107290 and fix it if it is affected.\n\nWhat it is: CVE-2026-107290 is a medium-severity denial of service vulnerability in pydantic-ai, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-107290 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- pydantic-ai (PyPI): affected from 1.77.0; fixed in 1.107.6, 2.44.0\n- pydantic-ai (PyPI): affected from 1.77.0; fixed in 1.107.6\n- pydantic-ai (PyPI): affected from 1.77.0; fixed in 1.107.6\n- pydantic-ai (PyPI): affected from 2.0.0b1; fixed in 2.44.0\n- pydantic-ai (PyPI): affected from 2.0.0b1; fixed in 2.44.0\n- pydantic-ai-slim (PyPI): affected from 1.77.0; fixed in 1.107.6, 2.44.0\n- pydantic-ai-slim (PyPI): affected from 1.77.0; fixed in 1.107.6\n- pydantic-ai-slim (PyPI): affected from 1.77.0; fixed in 1.107.6\n- pydantic-ai-slim (PyPI): affected from 2.0.0b1; fixed in 2.44.0\n- pydantic-ai-slim (PyPI): affected from 2.0.0b1; fixed in 2.44.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-107290/ (Markdown: https://insights.sbomify.com/CVE-2026-107290/index.md)","id":"CVE-2026-107290","markdown":"https://insights.sbomify.com/CVE-2026-107290/index.md","name":"CVE-2026-107290","record":{"aliases":["CLEANSTART-2026-DI21626","GHSA-fpf4-vwcp-v4hp","PYSEC-2026-4277","PYSEC-2026-4286"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python AI agent framework","requires_auth":"low_privilege","summary":"An attacker can cause a denial of service by blocking the event loop via quadratic processing in the web_fetch tool of Pydantic AI.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pydantic_ai","vendor":"pydantic"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-1333","name":"Inefficient Regular Expression Complexity"}],"description":"Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback process server-controlled responses with quadratic title extraction, whitespace normalization, and ordered-list numbering. An attacker-controlled page of modest size can therefore block the event loop for an extended period, stalling other agent runs and requests, while unsupported codecs or excessive HTML or JSON nesting can abort an individual run. This issue is fixed in versions 1.107.6 and 2.44.0.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Pydantic AI: Event loop blocked by quadratic title extraction in `web_fetch`","id":"CVE-2026-107290","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":10,"n_references":13,"next":{"headline":"Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`","id":"CVE-2026-107291"},"packages":[{"ecosystem":"PyPI","fixed":["1.107.6","2.44.0"],"introduced":["1.77.0","2.0.0b1"],"last_affected":[],"package":"pydantic-ai","purl":"pkg:pypi/pydantic-ai","source":"PYSEC-2026-4277"},{"ecosystem":"PyPI","fixed":["1.107.6"],"introduced":["1.77.0"],"last_affected":[],"package":"pydantic-ai","purl":null,"source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["1.107.6"],"introduced":["1.77.0"],"last_affected":[],"package":"pydantic-ai","purl":"pkg:pypi/pydantic-ai","source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["2.44.0"],"introduced":["2.0.0b1"],"last_affected":[],"package":"pydantic-ai","purl":null,"source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["2.44.0"],"introduced":["2.0.0b1"],"last_affected":[],"package":"pydantic-ai","purl":"pkg:pypi/pydantic-ai","source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["1.107.6","2.44.0"],"introduced":["1.77.0","2.0.0b1"],"last_affected":[],"package":"pydantic-ai-slim","purl":"pkg:pypi/pydantic-ai-slim","source":"PYSEC-2026-4286"},{"ecosystem":"PyPI","fixed":["1.107.6"],"introduced":["1.77.0"],"last_affected":[],"package":"pydantic-ai-slim","purl":null,"source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["1.107.6"],"introduced":["1.77.0"],"last_affected":[],"package":"pydantic-ai-slim","purl":"pkg:pypi/pydantic-ai-slim","source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["2.44.0"],"introduced":["2.0.0b1"],"last_affected":[],"package":"pydantic-ai-slim","purl":null,"source":"GHSA-fpf4-vwcp-v4hp"},{"ecosystem":"PyPI","fixed":["2.44.0"],"introduced":["2.0.0b1"],"last_affected":[],"package":"pydantic-ai-slim","purl":"pkg:pypi/pydantic-ai-slim","source":"GHSA-fpf4-vwcp-v4hp"}],"prev":{"headline":"Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers","id":"CVE-2026-107289"},"products":["pydantic-ai","pydantic-ai-slim"],"published":"2026-10-08","related":[{"cvss_score":8.6,"headline":"Pydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download Handling","id":"CVE-2026-25580","kev_date_added":null,"published":"2026-02-06"},{"cvss_score":7.6,"headline":"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","id":"CVE-2026-107295","kev_date_added":null,"published":"2026-10-08"},{"cvss_score":7.5,"headline":"Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early","id":"CVE-2026-107286","kev_date_added":null,"published":"2026-10-08"},{"cvss_score":7.1,"headline":"Pydantic AI affected by Stored XSS via Path Traversal in Web UI CDN URL","id":"CVE-2026-25640","kev_date_added":null,"published":"2026-02-06"},{"cvss_score":6.8,"headline":"Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers","id":"CVE-2026-107289","kev_date_added":null,"published":"2026-10-08"},{"cvss_score":6.8,"headline":"Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)","id":"CVE-2026-46678","kev_date_added":null,"published":"2026-07-29"},{"cvss_score":6.8,"headline":"Pydantic AI: Unvalidated UploadedFile references in UI adapters allow server-side file access using the application's credentials","id":"CVE-2026-54249","kev_date_added":null,"published":"2026-07-29"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-09","vendors":["pydantic"]},"summary":"An attacker can cause a denial of service by blocking the event loop via quadratic processing in the web_fetch tool of Pydantic AI.","url":"https://insights.sbomify.com/CVE-2026-107290/"}