{"answers":{"affected":"2 open source packages ship an affected version, including engine.io. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-59725 in the wild and no public exploit code.","fix":"Upgrade engine.io to 6.6.7 or later.","what":"CVE-2026-59725 is a high-severity denial of service vulnerability in socketio engine.io, published on 8 Jul 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-2026-59725 and fix it if it is affected.\n\nWhat it is: CVE-2026-59725 is a high-severity denial of service vulnerability in socketio engine.io, published on 8 Jul 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-2026-59725 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- engine.io (npm): affected from 4.1.0; fixed in 6.6.7\n- engine.io (npm): affected from 4.1.0; fixed in 6.6.7\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-2026-59725/ (Markdown: https://insights.sbomify.com/CVE-2026-59725/index.md)","id":"CVE-2026-59725","markdown":"https://insights.sbomify.com/CVE-2026-59725/index.md","name":"CVE-2026-59725","record":{"aliases":["CLSA-2026-1792617714","GHSA-r635-g3xr-vw7x","MINI-53xc-4g7r-8phh","MINI-fpwc-2vr2-pg7r","RHSA-2026:42986","ROOT-APP-NPM-CVE-2026-59725"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Socket.IO library","requires_auth":"none","summary":"An unauthenticated attacker can exhaust server connections by sending invalid binary POST requests, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"engine.io","vendor":"socket"}],"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-404","name":"Improper Resource Shutdown or Release"}],"description":"Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.","ecosystems":["Red Hat:hummingbird:1","npm"],"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":"Socket.IO: Engine.IO Polling Transport Connection Exhaustion","id":"CVE-2026-59725","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":7,"n_references":3,"next":{"headline":"Ruflo: Unauthenticated RCE in MCP bridge default docker-compose deployment","id":"CVE-2026-59726"},"packages":[{"ecosystem":"npm","fixed":["6.6.7"],"introduced":["4.1.0"],"last_affected":[],"package":"engine.io","purl":null,"source":"GHSA-r635-g3xr-vw7x"},{"ecosystem":"npm","fixed":["6.6.7"],"introduced":["4.1.0"],"last_affected":[],"package":"engine.io","purl":"pkg:npm/engine.io","source":"GHSA-r635-g3xr-vw7x"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:8.0.129-2.hum1"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0","purl":"pkg:rpm/redhat/dotnet-sdk-8.0","source":"RHSA-2026:42986"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:8.0.129-2.hum1"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0-source-built-artifacts","purl":"pkg:rpm/redhat/dotnet-sdk-8.0-source-built-artifacts","source":"RHSA-2026:42986"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:8.0.129-2.hum1"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-dbg-8.0","purl":"pkg:rpm/redhat/dotnet-sdk-dbg-8.0","source":"RHSA-2026:42986"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:8.0.129-2.hum1"],"introduced":["0"],"last_affected":[],"package":"dotnet-templates-8.0","purl":"pkg:rpm/redhat/dotnet-templates-8.0","source":"RHSA-2026:42986"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:8.0.129-2.hum1"],"introduced":["0"],"last_affected":[],"package":"dotnet8.0","purl":"pkg:rpm/redhat/dotnet8.0","source":"RHSA-2026:42986"}],"prev":{"headline":"Socket.IO: Engine.IO WebTransport SID DoS","id":"CVE-2026-59724"},"products":["engine.io"],"published":"2026-07-08","related":[{"cvss_score":7.5,"headline":"Socket.IO: Engine.IO WebTransport SID DoS","id":"CVE-2026-59724","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"Uncaught Exception in engine.io","id":"CVE-2022-21676","kev_date_added":null,"published":"2022-01-12"},{"cvss_score":7.5,"headline":"Resource exhaustion in engine.io","id":"CVE-2020-36048","kev_date_added":null,"published":"2021-01-07"},{"cvss_score":7.1,"headline":"Uncaught exception in engine.io","id":"CVE-2022-41940","kev_date_added":null,"published":"2022-11-22"},{"cvss_score":6.5,"headline":"Uncaught exception in engine.io","id":"CVE-2023-31125","kev_date_added":null,"published":"2023-05-08"}],"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":"Red Hat","prefix":"RHSA"},{"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["socketio"]},"summary":"An unauthenticated attacker can exhaust server connections by sending invalid binary POST requests, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2026-59725/"}