{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49140 exists.","fix":"No fix has been published for CVE-2026-49140 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-49140 is a medium-severity denial of service vulnerability in HKUDS nanobot, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-49140 and fix it if it is affected.\n\nWhat it is: CVE-2026-49140 is a medium-severity denial of service vulnerability in HKUDS nanobot, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49140 exists.\n\nAffected product: HKUDS nanobot. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-49140/ (Markdown: https://insights.sbomify.com/CVE-2026-49140/index.md)","id":"CVE-2026-49140","markdown":"https://insights.sbomify.com/CVE-2026-49140/index.md","name":"CVE-2026-49140","record":{"aliases":["GHSA-4rm2-fq3x-g7x7"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix bot framework","requires_auth":"low_privilege","summary":"Authenticated users can cause denial of service in Nanobot by sending Matrix media events with invalid size metadata, exhausting memory and bandwidth.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"Nanobot prior to version 0.2.1 contains a denial of service vulnerability in the Matrix channel media download handler that allows authenticated room members to exhaust process memory and bandwidth by sending media events with missing or invalid size metadata. Attackers can send multiple concurrent Matrix media events with omitted or invalid declared sizes to trigger simultaneous large media downloads that fully materialize response bodies before post-download rejection, consuming process resources until service degradation occurs.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Nanobot \u003c 0.2.1 Denial of Service via Matrix Media Download Handler","id":"CVE-2026-49140","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"WACRM Authorization Bypass via Automation Engine Endpoint","id":"CVE-2026-49141"},"packages":[],"prev":{"headline":"Nanobot \u003c 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning","id":"CVE-2026-49139"},"products":["nanobot"],"published":"2026-06-01","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["HKUDS"]},"summary":"Authenticated users can cause denial of service in Nanobot by sending Matrix media events with invalid size metadata, exhausting memory and bandwidth.","url":"https://insights.sbomify.com/CVE-2026-49140/"}