CVE-2026-32647

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This Out-of-Bounds Read/Write vulnerability occurs due to improper handling of specially crafted MP4 files. A local authenticated attacker, by supplying a malicious MP4 file, can trigger a buffer over-read or overwrite in worker memory. 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This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}, {"lang": "es", "value": "NGINX Open Source y NGINX Plus tienen una vulnerabilidad en el m\u00f3dulo ngx_http_mp4_module, que podr\u00eda permitir a un atacante desencadenar una lectura o escritura excesiva de b\u00fafer en la memoria del proceso worker de NGINX, lo que resultar\u00eda en su terminaci\u00f3n o posiblemente en la ejecuci\u00f3n de c\u00f3digo, utilizando un archivo MP4 especialmente dise\u00f1ado. Este problema afecta a NGINX Open Source y NGINX Plus si est\u00e1 compilado con el m\u00f3dulo ngx_http_mp4_module y la directiva mp4 se utiliza en el archivo de configuraci\u00f3n. Adem\u00e1s, el ataque es posible solo si un atacante puede desencadenar el procesamiento de un archivo MP4 especialmente dise\u00f1ado con el m\u00f3dulo ngx_http_mp4_module.\n\nNota: Las versiones de software que han alcanzado el Fin de Soporte T\u00e9cnico (EoTS) no son evaluadas."}], "id": "CVE-2026-32647", "lastModified": "2026-07-15T02:20:00.083", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "f5sirt@f5.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", 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{"acknowledgement": "Red Hat would like to thank Pavel Kohout (Aisle Research) for reporting this issue.", "bugzilla": {"description": "nginx: NGINX: Denial of Service or Code Execution via specially crafted MP4 files", "id": "2449598", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449598"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in NGINX's ngx_http_mp4_module. This Out-of-Bounds Read/Write vulnerability occurs due to improper handling of specially crafted MP4 files. A local authenticated attacker, by supplying a malicious MP4 file, can trigger a buffer over-read or overwrite in worker memory. This can lead to process termination, potentially causing a denial-of-service or, under certain conditions, achieving code execution."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable the ngx_http_mp4_module in your NGINX configuration if MP4 file processing is not required. This can be done by commenting out or removing the mp4 directive from the NGINX configuration file. After modifying the configuration, a reload or restart of the NGINX service is required for the changes to take effect.\nAlternatively, restrict access to the NGINX server to trusted networks and users to prevent the upload and processing of malicious MP4 files."}, "name": "CVE-2026-32647", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx:1.26/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:insights_proxy:1", "fix_state": "Affected", "package_name": "insights-proxy/insights-proxy-container-rhel9", "product_name": "Red Hat Lightspeed proxy 1"}], "public_date": "2026-03-24T18:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32647\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32647\nhttps://my.f5.com/manage/s/article/K000160366"], "statement": "This IMPORTANT vulnerability in the NGINX ngx_http_mp4_module is due to improper handling of specially crafted MP4 files. A local authenticated attacker could exploit this flaw by providing a malicious MP4 file, leading to a denial of service or potentially arbitrary code execution. Red Hat products utilizing NGINX with the ngx_http_mp4_module enabled are affected if untrusted MP4 files are processed.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.29.0,1.29.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.1.19,1.28.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Open Source", "source": "cna", "vendor": "F5"}, "product": "nginx_open_source", "vendor": "f5"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R36,R36 P3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R35,R35 P2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R34,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R33,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R32,R32 P5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Plus", "source": "cna", "vendor": "F5"}, "product": "nginx_plus", "vendor": "f5"}], "analysis": {"en": {"generated_at": "2026-03-26T22:32:24.918847+00:00", "value": {"mitigation_remediation": ["Update NGINX to the latest stable release that contains the fix for the ngx_http_mp4_module vulnerability, following the vendor advisory at https://my.f5.com/manage/s/article/K000160366. ", "If an update is not yet available or feasible, disable the ngx_http_mp4_module or remove any mp4 directives from the configuration to eliminate the attack surface.", "Restrict access to MP4 files by applying firewall or ACL rules that allow only trusted sources, or serve MP4 content through a separate backend that does not use the vulnerable module.", "Monitor NGINX worker process health and logs for unexpected crashes or memory errors and adjust alerting accordingly.", "Verify the NGINX configuration with `nginx -t` after changes and confirm that the module is no longer loaded."], "summary": {"action": "Immediate patch", "impact": "Memory corruption that may lead to code execution in NGINX workers"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all builds of F5's NGINX Open Source and NGINX\u00a0Plus that include the ngx_http_mp4_module and use the mp4 directive in their configuration. Specific product versions are not listed, so any installed version built with the module is potentially vulnerable. The module is present in NGINX\u00a0Plus releases from r32 onward, but all such builds are covered by the advisory.", "description_and_impact": "NGINX Open Source and NGINX Plus contain a flaw in the ngx_http_mp4_module that allows a specially crafted MP4 file to trigger a buffer over\u2011read or over\u2011write of worker memory. The resulting memory corruption can terminate the worker process or, in the worst case, enable arbitrary code execution within the NGINX worker\u2019s context. This is a classic out\u2011of\u2011bounds read/write condition (CWE\u2011125).", "risk_and_exploitability": "The CVSS base score of 8.5 indicates high severity, but the EPSS score of less than 1% suggests that active exploitation is currently rare. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires an attacker to deliver a crafted MP4 file that flows through the ngx_http_mp4_module, limiting the threat to environments that serve MP4 traffic via this module. Nonetheless, a successful exploit could crash workers or provide code\u2011execution privileges, warranting prompt mitigation."}}}}, "created": "2026-03-25T11:47:33.421315+00:00", "updated": "2026-03-27T09:21:03.755043+00:00", "vendors": ["f5", "f5$PRODUCT$nginx_open_source", "f5$PRODUCT$nginx_plus"]}