{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-47863 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-47863 is a medium-severity denial of service vulnerability in Spring Reactor Core, published on 26 Aug 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-2026-47863 and fix it if it is affected.\n\nWhat it is: CVE-2026-47863 is a medium-severity denial of service vulnerability in Spring Reactor Core, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-47863 in the wild and no public exploit code.\n\nAffected product: Spring Reactor Core. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-47863/ (Markdown: https://insights.sbomify.com/CVE-2026-47863/index.md)","id":"CVE-2026-47863","markdown":"https://insights.sbomify.com/CVE-2026-47863/index.md","name":"CVE-2026-47863","record":{"aliases":["CLEANSTART-2026-BH93909","CLEANSTART-2026-VH51135","CLSA-2026-1792063063","CLSA-2026-1793138070","GHSA-5jp2-w3vg-5w3x"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Java reactive library","requires_auth":"none","summary":"Attackers can cause permanent hangs in Reactor Core applications using bufferTimeout with fairBackpressure, leading to denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"vmware","cpe":[{"product":"reactor_core","vendor":"broadcom"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-835","name":"Loop with Unreachable Exit Condition"}],"description":"In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier","ecosystems":[],"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":"Denial of service in Reactor Core","id":"CVE-2026-47863","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Unsafe Java deserialization in SerializingHttpMessageConverter — remote code execution","id":"CVE-2026-47864"},"packages":[],"prev":{"headline":"ZipTransformer uses file_name header to build workDirectory path without sanitization","id":"CVE-2026-47862"},"products":["Reactor Core"],"published":"2026-08-26","related":[{"cvss_score":5.9,"headline":"Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around","id":"CVE-2026-47857","kev_date_added":null,"published":"2026-08-26"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-08-27","vendors":["Spring"]},"summary":"Attackers can cause permanent hangs in Reactor Core applications using bufferTimeout with fairBackpressure, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-47863/"}