{"answers":{"affected":"3 open source packages ship an affected version, including hackney. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47077 exists.","fix":"Upgrade hackney to 4.0.1 or later.","what":"CVE-2026-47077 is a high-severity denial of service vulnerability in benoitc hackney, published on 25 May 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-2026-47077 and fix it if it is affected.\n\nWhat it is: CVE-2026-47077 is a high-severity denial of service vulnerability in benoitc hackney, published on 25 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47077 exists.\n\nAffected packages and fixed versions:\n- hackney (Hex): affected from 2.0.0; fixed in 4.0.1\n- hackney (Hex): affected from 2.0.0; fixed in 4.0.1\n- hackney (Hex): affected from 2.0.0; fixed in 4.0.1\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-2026-47077/ (Markdown: https://insights.sbomify.com/CVE-2026-47077/index.md)","id":"CVE-2026-47077","markdown":"https://insights.sbomify.com/CVE-2026-47077/index.md","name":"CVE-2026-47077","record":{"aliases":["EEF-CVE-2026-47077","GHSA-jq4m-q6p2-8gwc"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Erlang HTTP client","requires_auth":"none","summary":"A malicious HTTP/3 server can cause an out-of-memory denial of service in the hackney library by sending slow, unbounded response chunks.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[{"product":"hackney","vendor":"benoitc"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1.","ecosystems":["Hex"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Unbounded body accumulation in HTTP/3 response loop in hackney","id":"CVE-2026-47077","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":"Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass","id":"CVE-2026-47078"},"packages":[{"ecosystem":"Hex","fixed":["4.0.1"],"introduced":["2.0.0"],"last_affected":[],"package":"hackney","purl":"pkg:hex/hackney","source":"EEF-CVE-2026-47077"},{"ecosystem":"Hex","fixed":["4.0.1"],"introduced":["2.0.0"],"last_affected":[],"package":"hackney","purl":null,"source":"GHSA-jq4m-q6p2-8gwc"},{"ecosystem":"Hex","fixed":["4.0.1"],"introduced":["2.0.0"],"last_affected":[],"package":"hackney","purl":"pkg:hex/hackney","source":"GHSA-jq4m-q6p2-8gwc"}],"prev":{"headline":"SSRF allowlist bypass via percent-encoded host in hackney","id":"CVE-2026-47076"},"products":["hackney"],"published":"2026-05-25","related":[{"cvss_score":8.7,"headline":"Infinite loop in Alt-Svc header parser in hackney","id":"CVE-2026-47066","kev_date_added":null,"published":"2026-05-25"},{"cvss_score":8.7,"headline":"Atom table exhaustion via unrecognized URL schemes in hackney","id":"CVE-2026-47067","kev_date_added":null,"published":"2026-05-25"},{"cvss_score":8.7,"headline":"Unbounded memory consumption in WebSocket client in hackney","id":"CVE-2026-47073","kev_date_added":null,"published":"2026-05-25"},{"cvss_score":8.2,"headline":"SOCKS5 TLS upgrade ignores caller timeout in hackney","id":"CVE-2026-47071","kev_date_added":null,"published":"2026-05-25"},{"cvss_score":6.9,"headline":"CRLF injection in WebSocket upgrade request in hackney","id":"CVE-2026-47072","kev_date_added":null,"published":"2026-05-25"},{"cvss_score":6.9,"headline":"SSRF allowlist bypass via percent-encoded host in hackney","id":"CVE-2026-47076","kev_date_added":null,"published":"2026-05-25"}],"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-27","vendors":["benoitc"]},"summary":"A malicious HTTP/3 server can cause an out-of-memory denial of service in the hackney library by sending slow, unbounded response chunks.","url":"https://insights.sbomify.com/CVE-2026-47077/"}