{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2026-4408 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-4408 is a critical command injection vulnerability in Redhat Enterprise Linux, published on 28 May 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-2026-4408 and fix it if it is affected.\n\nWhat it is: CVE-2026-4408 is a critical command injection vulnerability in Redhat Enterprise Linux, published on 28 May 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-2026-4408 in the wild and no public exploit code.\n\nAffected product: Redhat Enterprise Linux. 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-2026-4408/ (Markdown: https://insights.sbomify.com/CVE-2026-4408/index.md)","id":"CVE-2026-4408","markdown":"https://insights.sbomify.com/CVE-2026-4408/index.md","name":"CVE-2026-4408","record":{"aliases":["ALPINE-CVE-2026-4408","AZL-88883","CLSA-2026-1781175722","CLSA-2026-1781181291","CLSA-2026-1781186905","CLSA-2026-1781258405","CLSA-2026-1781343925","CLSA-2026-1781620050","CLSA-2026-1781627407","CLSA-2026-1782204526","CLSA-2026-1782977299","CLSA-2026-1782977935","CLSA-2026-1782988187","CLSA-2026-1782990961","DEBIAN-CVE-2026-4408","ECHO-e406-9590-08f0","GHSA-jg8v-92xc-cx65","UBUNTU-CVE-2026-4408"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"Samba file server","requires_auth":"none","summary":"Remote attackers can execute arbitrary commands on Samba servers if the check password script uses unescaped user input.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"enterprise_linux","vendor":"redhat"},{"product":"openshift_container_platform","vendor":"redhat"},{"product":"samba","vendor":"samba"}],"cvss":{"score":9,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"description":"A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the \"check password script\" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the \"check password script\" is used with %u and the samba-dcerpcd service is started as a system service.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-08-03","github_poc":1,"max_poc_stars":10,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-08-03T07:44:29Z","kind":"github_poc","ref":"https://github.com/SafeBreach-Labs/ForgottenButNotGone","stars":10,"title":"proof-of-concept scripts for 2 unauthenticated RCEs in Samba (CVE-2026-4408 \u0026 CVE-2026-4480) and local privilege escalation in TelnetD (CVE-2026-28372)"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Samba: remote code execution in samr","id":"CVE-2026-4408","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"redhat:enterprise_linux","products":["redhat:enterprise_linux","redhat:openshift_container_platform","samba:samba"],"type":"command_injection","year":"2026"},"n_packages":0,"n_references":24,"next":{"headline":"Subscribe To Comments Reloaded \u003c= 240119 - Improper Authorization to Unauthenticated Arbitrary Subscription Management","id":"CVE-2026-4409"},"packages":[],"prev":{"headline":"Out-of-bounds array write in Xpdf 4.06 due to missing validation","id":"CVE-2026-4407"},"products":["Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 10.0 Extended Update Support","Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7 Extended Lifecycle Support","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.8 Telecommunications Update Service","Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions","Red Hat Enterprise Linux 9","Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.6 Extended Update Support","Red Hat OpenShift Container Platform 4.12","Red Hat OpenShift Container Platform 4.13","Red Hat OpenShift Container Platform 4.14","Red Hat OpenShift Container Platform 4.15","Red Hat OpenShift Container Platform 4.16","Red Hat OpenShift Container Platform 4.17","Red Hat OpenShift Container Platform 4.18","Red Hat OpenShift Container Platform 4.19","Red Hat OpenShift Container Platform 4.20","Red Hat OpenShift Container Platform 4.21"],"published":"2026-05-28","related":[{"cvss_score":9.8,"headline":"Red Hat JBoss RichFaces Framework Expression Language Injection","id":"CVE-2018-14667","kev_date_added":"2023-09-28","published":"2018-11-06"},{"cvss_score":9.8,"headline":"Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit","id":"CVE-2021-20325","kev_date_added":null,"published":"2022-02-18"},{"cvss_score":9.8,"headline":"Memory corruption in libwebp","id":"CVE-2018-25011","kev_date_added":null,"published":"2021-05-21"},{"cvss_score":9.8,"headline":"Other in libwebp","id":"CVE-2018-25014","kev_date_added":null,"published":"2021-05-21"},{"cvss_score":9.8,"headline":"Supply chain in redhat-upgrade-tool","id":"CVE-2014-3585","kev_date_added":null,"published":"2019-11-22"},{"cvss_score":9.3,"headline":"Squid: request/response smuggling in http/1.1 and icap","id":"CVE-2023-46846","kev_date_added":null,"published":"2023-11-03"},{"cvss_score":9.1,"headline":"Memory corruption in libwebp","id":"CVE-2018-25009","kev_date_added":null,"published":"2021-05-21"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"total"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["Red Hat"]},"summary":"Remote attackers can execute arbitrary commands on Samba servers if the check password script uses unescaped user input.","url":"https://insights.sbomify.com/CVE-2026-4408/"}