{"answers":{"affected":"6 open source packages ship an affected version, including engine.io. It affects 1 product.","exploited":"There is no known exploitation of CVE-2022-21676 in the wild and no public exploit code.","fix":"Upgrade engine.io to a fixed version for your release line: 4.1.2, 5.2.1 or 6.1.1.","what":"CVE-2022-21676 is a high-severity denial of service vulnerability in socketio engine.io, published on 12 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2022-21676 and fix it if it is affected.\n\nWhat it is: CVE-2022-21676 is a high-severity denial of service vulnerability in socketio engine.io, published on 12 Jan 2022. 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-2022-21676 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- engine.io (npm): affected from 4.0.0; fixed in 4.1.2\n- engine.io (npm): affected from 4.0.0; fixed in 4.1.2\n- engine.io (npm): affected from 5.0.0; fixed in 5.2.1\n- engine.io (npm): affected from 5.0.0; fixed in 5.2.1\n- engine.io (npm): affected from 6.0.0; fixed in 6.1.1\n- engine.io (npm): affected from 6.0.0; fixed in 6.1.1\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-2022-21676/ (Markdown: https://insights.sbomify.com/CVE-2022-21676/index.md)","id":"CVE-2022-21676","markdown":"https://insights.sbomify.com/CVE-2022-21676/index.md","name":"CVE-2022-21676","record":{"aliases":["GHSA-273r-mgr4-v34f"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js communication library","requires_auth":"none","summary":"A specially crafted HTTP request can crash the Node.js process in Engine.IO, causing denial of service for applications using this library.","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-755","name":"Improper Handling of Exceptional Conditions"},{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"}],"description":"Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the `engine.io` package starting from version `4.0.0`, including those who uses depending packages like `socket.io`. Versions prior to `4.0.0` are not impacted. A fix has been released for each major branch, namely `4.1.2` for the `4.x.x` branch, `5.2.1` for the `5.x.x` branch, and `6.1.1` for the `6.x.x` branch. There is no known workaround except upgrading to a safe version.","ecosystems":["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":"Uncaught Exception in engine.io","id":"CVE-2022-21676","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2022"},"n_packages":6,"n_references":8,"next":{"headline":"Group advanced search option may leak group and group's members visibility","id":"CVE-2022-21677"},"packages":[{"ecosystem":"npm","fixed":["4.1.2"],"introduced":["4.0.0"],"last_affected":[],"package":"engine.io","purl":null,"source":"GHSA-273r-mgr4-v34f"},{"ecosystem":"npm","fixed":["4.1.2"],"introduced":["4.0.0"],"last_affected":[],"package":"engine.io","purl":"pkg:npm/engine.io","source":"GHSA-273r-mgr4-v34f"},{"ecosystem":"npm","fixed":["5.2.1"],"introduced":["5.0.0"],"last_affected":[],"package":"engine.io","purl":null,"source":"GHSA-273r-mgr4-v34f"},{"ecosystem":"npm","fixed":["5.2.1"],"introduced":["5.0.0"],"last_affected":[],"package":"engine.io","purl":"pkg:npm/engine.io","source":"GHSA-273r-mgr4-v34f"},{"ecosystem":"npm","fixed":["6.1.1"],"introduced":["6.0.0"],"last_affected":[],"package":"engine.io","purl":null,"source":"GHSA-273r-mgr4-v34f"},{"ecosystem":"npm","fixed":["6.1.1"],"introduced":["6.0.0"],"last_affected":[],"package":"engine.io","purl":"pkg:npm/engine.io","source":"GHSA-273r-mgr4-v34f"}],"prev":{"headline":"Bytecode Viewer v2.10.x Zip Slip","id":"CVE-2022-21675"},"products":["engine.io"],"published":"2022-01-12","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":"Socket.IO: Engine.IO Polling Transport Connection Exhaustion","id":"CVE-2026-59725","kev_date_added":null,"published":"2026-07-08"},{"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":"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":"2025-04-23","vendors":["socketio"]},"summary":"A specially crafted HTTP request can crash the Node.js process in Engine.IO, causing denial of service for applications using this library.","url":"https://insights.sbomify.com/CVE-2022-21676/"}