{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-86547 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-86547 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86547 is a medium-severity vulnerability in mrubyc, published on 9 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-86547 and fix it if it is affected.\n\nWhat it is: CVE-2026-86547 is a medium-severity vulnerability in mrubyc, published on 9 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-86547 in the wild and no public exploit code.\n\nAffected product: mrubyc. 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-2026-86547/ (Markdown: https://insights.sbomify.com/CVE-2026-86547/index.md)","id":"CVE-2026-86547","markdown":"https://insights.sbomify.com/CVE-2026-86547/index.md","name":"CVE-2026-86547","record":{"aliases":["GHSA-42q4-rvcw-q7wc"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Ruby VM library","requires_auth":"none","summary":"Attackers can crash applications embedding mrubyc by providing malicious bytecode, causing a denial of service via null pointer dereference.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/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-476","name":"NULL Pointer Dereference"}],"description":"mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embedding application and cause denial of service.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-09-12","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-12T06:16:43Z","kind":"github_poc","ref":"https://github.com/HarshRajSinghania/cve-2026-86547-mrubyc-op-enter","stars":0,"title":"Standalone proof of concept for CVE-2026-86547, a NULL pointer dereference in mrubyc op_enter() through 4.0.0."}],"tier":"poc_unverified"},"has_fix":false,"headline":"mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER","id":"CVE-2026-86547","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"UXSS vulnerability in ZTE browser products","id":"CVE-2026-86550"},"packages":[],"prev":{"headline":"knowns before 0.30.0 Authorization Bypass via Misclassified Code Actions","id":"CVE-2026-86544"},"products":["mrubyc"],"published":"2026-09-09","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":"2026-09-09","vendors":["mrubyc"]},"summary":"Attackers can crash applications embedding mrubyc by providing malicious bytecode, causing a denial of service via null pointer dereference.","url":"https://insights.sbomify.com/CVE-2026-86547/"}