{"answers":{"affected":"3 open source packages ship an affected version, including fastfeedparser. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39376 exists.","fix":"Upgrade fastfeedparser to 0.5.10 or later.","what":"CVE-2026-39376 is a high-severity denial of service vulnerability in kagisearch fastfeedparser, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-39376 and fix it if it is affected.\n\nWhat it is: CVE-2026-39376 is a high-severity denial of service vulnerability in kagisearch fastfeedparser, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39376 exists.\n\nAffected packages and fixed versions:\n- fastfeedparser (PyPI): affected all versions; fixed in 0.5.10\n- fastfeedparser (PyPI): affected all versions; fixed in 0.5.10\n- fastfeedparser (PyPI): affected all versions; fixed in 0.5.10\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-2026-39376/ (Markdown: https://insights.sbomify.com/CVE-2026-39376/index.md)","id":"CVE-2026-39376","markdown":"https://insights.sbomify.com/CVE-2026-39376/index.md","name":"CVE-2026-39376","record":{"aliases":["GHSA-4gx2-pc4f-wq37","PYSEC-2026-60"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python RSS parser","requires_auth":"none","summary":"An attacker can cause a denial of service in FastFeedParser by triggering an infinite recursion loop via chained meta-refresh redirects.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fastfeedparser","vendor":"kagi"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-674","name":"Uncontrolled Recursion"}],"description":"FastFeedParser is a high performance RSS, Atom and RDF parser. Prior to 0.5.10, when parse() fetches a URL that returns an HTML page containing a \u003cmeta http-equiv=\"refresh\"\u003e tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An attacker-controlled server that returns an infinite chain of HTML meta-refresh responses causes unbounded recursion, exhausting the Python call stack and crashing the process. This vulnerability can also be chained with the companion SSRF issue to reach internal network targets after bypassing the initial URL check. This vulnerability is fixed in 0.5.10.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":"2026-04-10","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-04-10T05:39:38Z","kind":"github_poc","ref":"https://github.com/redyank/CVE-2026-39376","stars":0,"title":"CVE-2026-39376(Infinite redirect loop DoS via meta-refresh chain)"}],"tier":"weaponised"},"has_fix":true,"headline":"FastFeedParser has an infinite redirect loop DoS via meta-refresh chain","id":"CVE-2026-39376","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"nbconvert has an Arbitrary File Write via Path Traversal in Cell Attachment Filenames","id":"CVE-2026-39377"},"packages":[{"ecosystem":"PyPI","fixed":["0.5.10"],"introduced":["0"],"last_affected":[],"package":"fastfeedparser","purl":null,"source":"GHSA-4gx2-pc4f-wq37"},{"ecosystem":"PyPI","fixed":["0.5.10"],"introduced":["0"],"last_affected":[],"package":"fastfeedparser","purl":"pkg:pypi/fastfeedparser","source":"GHSA-4gx2-pc4f-wq37"},{"ecosystem":"PyPI","fixed":["0.5.10"],"introduced":["0"],"last_affected":[],"package":"fastfeedparser","purl":"pkg:pypi/fastfeedparser","source":"PYSEC-2026-60"}],"prev":{"headline":"Plane IDOR: Cross-Project Issue Date Modification via Bulk Update Endpoint","id":"CVE-2026-39374"},"products":["fastfeedparser"],"published":"2026-04-07","related":[],"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-08","vendors":["kagisearch"]},"summary":"An attacker can cause a denial of service in FastFeedParser by triggering an infinite recursion loop via chained meta-refresh redirects.","url":"https://insights.sbomify.com/CVE-2026-39376/"}