{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-101276 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-101276 is a critical use after free vulnerability in esnet iperf3, published on 30 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-2026-101276 and fix it if it is affected.\n\nWhat it is: CVE-2026-101276 is a critical use after free vulnerability in esnet iperf3, published on 30 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-2026-101276 in the wild and no public exploit code.\n\nAffected product: esnet iperf3. 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-2026-101276/ (Markdown: https://insights.sbomify.com/CVE-2026-101276/index.md)","id":"CVE-2026-101276","markdown":"https://insights.sbomify.com/CVE-2026-101276/index.md","name":"CVE-2026-101276","record":{"aliases":["AZL-105492","BELL-CVE-2026-101276","DEBIAN-CVE-2026-101276","GHSA-pmgg-x2vj-36cv","UBUNTU-CVE-2026-101276"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Network performance tool","requires_auth":"none","summary":"Remote unauthenticated attackers can trigger a heap use-after-free in iperf3 server, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Anthropic","cpe":[],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Use after free in iperf3","id":"CVE-2026-101276","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Trusted Domain Project OpenDKIM Tag Tokenizer dkim.c dkim_process_set less trusted source","id":"CVE-2026-101277"},"packages":[],"prev":{"headline":"When pretix is used as the identity provider in a Single-Sign-On (SSO) setup for customer accounts, the system did not properly validate the","id":"CVE-2026-101274"},"products":["iperf3"],"published":"2026-09-30","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":"total"},"state":"PUBLISHED","updated":"2026-10-01","vendors":["esnet"]},"summary":"Remote unauthenticated attackers can trigger a heap use-after-free in iperf3 server, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2026-101276/"}