{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-66749 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-66749 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-66749 is a high-severity vulnerability in sdelements lets-chat, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-66749 and fix it if it is affected.\n\nWhat it is: CVE-2026-66749 is a high-severity vulnerability in sdelements lets-chat, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-66749 in the wild and no public exploit code.\n\nAffected product: sdelements lets-chat. 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-2026-66749/ (Markdown: https://insights.sbomify.com/CVE-2026-66749/index.md)","id":"CVE-2026-66749","markdown":"https://insights.sbomify.com/CVE-2026-66749/index.md","name":"CVE-2026-66749","record":{"aliases":["GHSA-qjpw-62vp-8j4q"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Let's Chat","requires_auth":"low_privilege","summary":"Authenticated attackers can crash the Let's Chat server by sending a crafted request with a non-existent room ID, causing a null dereference.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"Let's Chat 0.4.0 through 0.4.8 contains a null dereference vulnerability that allows authenticated attackers to crash the server by supplying a valid 24-character hex string room parameter that matches no document in the database. Attackers can send a crafted GET /messages request causing an uncaught TypeError in an asynchronous Mongoose callback that terminates the Node.js server process, with the same defect reachable through multiple code paths including the socket.io interface.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-07-26","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-26T14:27:54Z","kind":"github_poc","ref":"https://github.com/theopaid/CVE-2026-66749-Unchecked-Room-Lookup-Leads-to-Server-Crash-Let-s-Chat-","stars":0,"title":"Security Advisory: Unchecked Room Lookup Leads to Server Crash (Let's Chat)"}],"tier":"poc_unverified"},"has_fix":false,"headline":"Let's Chat 0.4.0 - 0.4.8 Denial of Service via Null Dereference in Room Lookup","id":"CVE-2026-66749","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Let's Chat 0.3.0 - 0.4.8 Broken Access Control File Disclosure via GET /files route","id":"CVE-2026-66750"},"packages":[],"prev":{"headline":"Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field","id":"CVE-2026-66748"},"products":["lets-chat"],"published":"2026-07-28","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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["sdelements"]},"summary":"Authenticated attackers can crash the Let's Chat server by sending a crafted request with a non-existent room ID, causing a null dereference.","url":"https://insights.sbomify.com/CVE-2026-66749/"}