{"answers":{"affected":"3 open source packages ship an affected version, including plug_cowboy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-32688 in the wild and no public exploit code.","fix":"Upgrade plug_cowboy to 2.8.1 or later.","what":"CVE-2026-32688 is a high-severity denial of service vulnerability in elixir-plug plug_cowboy, published on 27 Apr 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-2026-32688 and fix it if it is affected.\n\nWhat it is: CVE-2026-32688 is a high-severity denial of service vulnerability in elixir-plug plug_cowboy, published on 27 Apr 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-2026-32688 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- plug_cowboy (Hex): affected from 2.0.0; fixed in 2.8.1\n- plug_cowboy (Hex): affected from 2.0.0; fixed in 2.8.1\n- plug_cowboy (Hex): affected from 2.0.0; fixed in 2.8.1\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-2026-32688/ (Markdown: https://insights.sbomify.com/CVE-2026-32688/index.md)","id":"CVE-2026-32688","markdown":"https://insights.sbomify.com/CVE-2026-32688/index.md","name":"CVE-2026-32688","record":{"aliases":["EEF-CVE-2026-32688","GHSA-q8x4-x7mp-5vg2"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Elixir HTTP server library","requires_auth":"none","summary":"Unauthenticated attackers can crash the Erlang VM by exhausting the atom table via malicious HTTP/2 scheme headers in plug_cowboy.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[{"product":"plug.cowboy","vendor":"elixir-plug"}],"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-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.\n\nPlug.Cowboy.Conn.conn/1 in lib/plug/cowboy/conn.ex calls String.to_atom/1 on the value returned by :cowboy_req.scheme/1. For HTTP/2 connections, cowlib passes the client-supplied :scheme pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atoms are never garbage-collected and the atom table has a fixed limit (default 1,048,576), an unauthenticated attacker can exhaust the table by sending HTTP/2 requests with unique :scheme values, causing the Erlang VM to abort with system_limit and taking down the entire node.\n\nThis vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.\n\nThis issue affects plug_cowboy: from 2.0.0 before 2.8.1.","ecosystems":["Hex"],"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":"Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy","id":"CVE-2026-32688","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"Long-poll NDJSON body splitting causes unbounded memory allocation in Phoenix","id":"CVE-2026-32689"},"packages":[{"ecosystem":"Hex","fixed":["2.8.1"],"introduced":["2.0.0"],"last_affected":[],"package":"plug_cowboy","purl":"pkg:hex/plug_cowboy","source":"EEF-CVE-2026-32688"},{"ecosystem":"Hex","fixed":["2.8.1"],"introduced":["2.0.0"],"last_affected":[],"package":"plug_cowboy","purl":null,"source":"GHSA-q8x4-x7mp-5vg2"},{"ecosystem":"Hex","fixed":["2.8.1"],"introduced":["2.0.0"],"last_affected":[],"package":"plug_cowboy","purl":"pkg:hex/plug_cowboy","source":"GHSA-q8x4-x7mp-5vg2"}],"prev":{"headline":"SQL injection via channel name in Postgrex.Notifications.listen/3 and unlisten/3","id":"CVE-2026-32687"},"products":["plug_cowboy"],"published":"2026-04-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Erlang Ecosystem Foundation","prefix":"EEF"},{"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":"2026-04-29","vendors":["elixir-plug"]},"summary":"Unauthenticated attackers can crash the Erlang VM by exhausting the atom table via malicious HTTP/2 scheme headers in plug_cowboy.","url":"https://insights.sbomify.com/CVE-2026-32688/"}