{"answers":{"affected":"3 open source packages ship an affected version, including python-engineio.","exploited":"There is no known exploitation of CVE-2026-48802 in the wild and no public exploit code.","fix":"Upgrade python-engineio to 4.13.2 or later.","what":"CVE-2026-48802 is a high-severity denial of service vulnerability in miguelgrinberg python-engineio, published on 11 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-2026-48802 and fix it if it is affected.\n\nWhat it is: CVE-2026-48802 is a high-severity denial of service vulnerability in miguelgrinberg python-engineio, published on 11 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-2026-48802 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- python-engineio (PyPI): affected all versions; fixed in 4.13.2\n- python-engineio (PyPI): affected all versions; fixed in 4.13.2\n- python-engineio (PyPI): affected all versions; fixed in 4.13.2\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-2026-48802/ (Markdown: https://insights.sbomify.com/CVE-2026-48802/index.md)","id":"CVE-2026-48802","markdown":"https://insights.sbomify.com/CVE-2026-48802/index.md","name":"CVE-2026-48802","record":{"aliases":["DEBIAN-CVE-2026-48802","GHSA-cgwc-pv48-fhj5","PYSEC-2026-3032","ROOT-APP-PYPI-CVE-2026-48802","UBUNTU-CVE-2026-48802"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python Engine.IO library","requires_auth":"none","summary":"An attacker can cause denial of service in python-engineio synchronous servers by triggering unbound thread allocation via the heartbeat mechanism.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"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-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet. This issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case. Version 4.13.2 addresses this issue as follows: The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the `connect` handler; and the server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.","ecosystems":["PyPI"],"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":"python-engineio has unbound thread allocation that can cause denial of service","id":"CVE-2026-48802","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"python-socketio: Binary attachment accumulation can cause denial of service","id":"CVE-2026-48804"},"packages":[{"ecosystem":"PyPI","fixed":["4.13.2"],"introduced":["0"],"last_affected":[],"package":"python-engineio","purl":null,"source":"GHSA-cgwc-pv48-fhj5"},{"ecosystem":"PyPI","fixed":["4.13.2"],"introduced":["0"],"last_affected":[],"package":"python-engineio","purl":"pkg:pypi/python-engineio","source":"GHSA-cgwc-pv48-fhj5"},{"ecosystem":"PyPI","fixed":["4.13.2"],"introduced":["0"],"last_affected":[],"package":"python-engineio","purl":"pkg:pypi/python-engineio","source":"PYSEC-2026-3032"}],"prev":{"headline":"linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop","id":"CVE-2026-48801"},"products":["python-engineio"],"published":"2026-08-11","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":"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":"2026-08-13","vendors":["miguelgrinberg"]},"summary":"An attacker can cause denial of service in python-engineio synchronous servers by triggering unbound thread allocation via the heartbeat mechanism.","url":"https://insights.sbomify.com/CVE-2026-48802/"}