{"answers":{"affected":"6 open source packages ship an affected version, including socket.io-parser. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33151 in the wild and no public exploit code.","fix":"Upgrade socket.io-parser to a fixed version for your release line: 3.3.5, 3.4.4 or 4.2.6.","what":"CVE-2026-33151 is a high-severity denial of service vulnerability in socketio socket.io, published on 20 Mar 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-2026-33151 and fix it if it is affected.\n\nWhat it is: CVE-2026-33151 is a high-severity denial of service vulnerability in socketio socket.io, published on 20 Mar 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-2026-33151 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- socket.io-parser (npm): affected all versions; fixed in 3.3.5\n- socket.io-parser (npm): affected all versions; fixed in 3.3.5\n- socket.io-parser (npm): affected from 3.4.0; fixed in 3.4.4\n- socket.io-parser (npm): affected from 3.4.0; fixed in 3.4.4\n- socket.io-parser (npm): affected from 4.0.0; fixed in 4.2.6\n- socket.io-parser (npm): affected from 4.0.0; fixed in 4.2.6\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-2026-33151/ (Markdown: https://insights.sbomify.com/CVE-2026-33151/index.md)","id":"CVE-2026-33151","markdown":"https://insights.sbomify.com/CVE-2026-33151/index.md","name":"CVE-2026-33151","record":{"aliases":["CLSA-2026-1779324474","CLSA-2026-1779324475","CLSA-2026-1779324477","CLSA-2026-1784769501","DEBIAN-CVE-2026-33151","GHSA-677m-j7p3-52f9","ROOT-APP-NPM-CVE-2026-33151","UBUNTU-CVE-2026-33151"],"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":"Attackers can cause server memory exhaustion by sending crafted packets with excessive binary attachments, leading to denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"socket.io-parser","vendor":"socket"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.","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":"socket.io allows an unbounded number of binary attachments","id":"CVE-2026-33151","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":6,"n_references":4,"next":{"headline":"Tandoor Recipes Vulnerable to Unrestricted Brute-Force via BasicAuthentication","id":"CVE-2026-33152"},"packages":[{"ecosystem":"npm","fixed":["3.3.5"],"introduced":["0"],"last_affected":[],"package":"socket.io-parser","purl":null,"source":"GHSA-677m-j7p3-52f9"},{"ecosystem":"npm","fixed":["3.3.5"],"introduced":["0"],"last_affected":[],"package":"socket.io-parser","purl":"pkg:npm/socket.io-parser","source":"GHSA-677m-j7p3-52f9"},{"ecosystem":"npm","fixed":["3.4.4"],"introduced":["3.4.0"],"last_affected":[],"package":"socket.io-parser","purl":null,"source":"GHSA-677m-j7p3-52f9"},{"ecosystem":"npm","fixed":["3.4.4"],"introduced":["3.4.0"],"last_affected":[],"package":"socket.io-parser","purl":"pkg:npm/socket.io-parser","source":"GHSA-677m-j7p3-52f9"},{"ecosystem":"npm","fixed":["4.2.6"],"introduced":["4.0.0"],"last_affected":[],"package":"socket.io-parser","purl":null,"source":"GHSA-677m-j7p3-52f9"},{"ecosystem":"npm","fixed":["4.2.6"],"introduced":["4.0.0"],"last_affected":[],"package":"socket.io-parser","purl":"pkg:npm/socket.io-parser","source":"GHSA-677m-j7p3-52f9"}],"prev":{"headline":"Use After Free in libfuse","id":"CVE-2026-33150"},"products":["socket.io"],"published":"2026-03-20","related":[{"cvss_score":10,"headline":"Socket.io - Improper type validation in attachment parsing","id":"CVE-2022-2421","kev_date_added":null,"published":"2022-10-25"},{"cvss_score":7.5,"headline":"Resource exhaustion in socket.io-parser","id":"CVE-2020-36049","kev_date_added":null,"published":"2021-01-07"},{"cvss_score":7.3,"headline":"Insufficient validation when decoding a Socket.IO packet","id":"CVE-2023-32695","kev_date_added":null,"published":"2023-05-27"}],"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":"2026-03-23","vendors":["socketio"]},"summary":"Attackers can cause server memory exhaustion by sending crafted packets with excessive binary attachments, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-33151/"}