{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-17539 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-17539 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-17539 is a medium-severity vulnerability in Hitachi Energy RTU500 series CMU firmware, published on 3 Sep 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-2026-17539 and fix it if it is affected.\n\nWhat it is: CVE-2026-17539 is a medium-severity vulnerability in Hitachi Energy RTU500 series CMU firmware, published on 3 Sep 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-2026-17539 in the wild and no public exploit code.\n\nAffected product: Hitachi Energy RTU500 series CMU firmware. 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-2026-17539/ (Markdown: https://insights.sbomify.com/CVE-2026-17539/index.md)","id":"CVE-2026-17539","markdown":"https://insights.sbomify.com/CVE-2026-17539/index.md","name":"CVE-2026-17539","record":{"aliases":["GHSA-9w2f-4f52-qcj4"],"analysis":{"component_type":"ics_ot","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"RTU500 series CMU firmware","requires_auth":"none","summary":"High-load IEC 104 requests trigger a NULL pointer dereference in Hitachi RTU500 firmware, causing connection restarts and denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Hitachi Energy","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Null dereference in RTU500 series CMU firmware","id":"CVE-2026-17539","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Bit File Manager \u003c 6.9.1 - Subscriber+ Arbitrary File Read and Deletion via Connector Command Request-Source Mismatch","id":"CVE-2026-17540"},"packages":[],"prev":{"headline":"Missing authorization in Appointment Booking Plugin – LatePoint | Calendar \u0026 Scheduling for WordPress","id":"CVE-2026-17538"},"products":["RTU500 series CMU firmware"],"published":"2026-09-03","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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-03","vendors":["Hitachi Energy"]},"summary":"High-load IEC 104 requests trigger a NULL pointer dereference in Hitachi RTU500 firmware, causing connection restarts and denial of service.","url":"https://insights.sbomify.com/CVE-2026-17539/"}