{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-4271", "tracking": { "current_release_date": "2026-03-24T21:34:48.339645Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4271", "initial_release_date": "2026-03-17T11:38:42.524728Z", "revision_history": [ { "date": "2026-03-17T11:38:42.524728Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-17T11:38:55.993829Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-17T12:25:25.113683Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-17T12:25:32.024684Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-17T12:31:49.889677Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (10).| Product Identifiers created (5).| Product Remediations created (10).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-17T12:31:58.130731Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-17T13:38:51.634771Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-03-17T14:39:04.987643Z", "number": "8", "summary": "Unknown change." }, { "date": "2026-03-17T14:57:46.647125Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-17T15:37:44.144524Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-18T00:43:07.269484Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Products connected (3)." }, { "date": "2026-03-18T00:43:17.558772Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-18T06:43:23.051422Z", "number": "13", "summary": "Description created for source." }, { "date": "2026-03-20T09:26:17.216037Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:26:21.739994Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:17:36.190401Z", "number": "16", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (6).| Product Identifiers created (6).| Exploits created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:17:39.054225Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:19:36.537406Z", "number": "18", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1).| Unknown change." }, { "date": "2026-03-20T21:56:48.291567Z", "number": "19", "summary": "EPSS updated." }, { "date": "2026-03-24T21:34:43.196555Z", "number": "20", "summary": "EPSS updated." } ], "status": "interim", "version": "20" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/6", "product": { "name": "vers:rpm/6", "product_id": "CSAFPID-1439321", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:6" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439315", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/10.0", "product": { "name": "vers:unknown/10.0", "product_id": "CSAFPID-2941214", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/6.0", "product": { "name": "vers:unknown/6.0", "product_id": "CSAFPID-1992585", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:6.9:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/7.0", "product": { "name": "vers:unknown/7.0", "product_id": "CSAFPID-1992579", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:6.9:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/8.0", "product": { "name": "vers:unknown/8.0", "product_id": "CSAFPID-1994226", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/9.0", "product": { "name": "vers:unknown/9.0", "product_id": "CSAFPID-2001071", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "enterprise_linux" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2618547" } } ], "category": "product_name", "name": "libsoup" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2618548" } } ], "category": "product_name", "name": "libsoup" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2618549" } } ], "category": "product_name", "name": "libsoup" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2618550" } } ], "category": "product_name", "name": "libsoup" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2965651" } } ], "category": "product_name", "name": "libsoup3" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5873934", "product_identification_helper": { "cpe": "cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "libsoup" } ], "category": "vendor", "name": "Gnome" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2617521" } } ], "category": "product_name", "name": "libsoup2.4" }, { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2563067" } } ], "category": "product_name", "name": "libsoup3" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2617522" } } ], "category": "product_name", "name": "libsoup2.4" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4271", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-4271" }, { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-4271" }, { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).\nThis MODERATE impact use-after-free flaw in libsoup's HTTP/2 server implementation affects applications that use libsoup to handle HTTP/2 server callbacks. An attacker can trigger this by sending HTTP/2 requests that cause authentication validation failures, potentially leading to application instability or crashes. Red Hat products are affected if they leverage libsoup as an HTTP/2 server and disconnect client connections during header processing.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-4271" }, { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-4271" }, { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4271" }, { "category": "description", "text": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4271.json" }, { "category": "other", "text": "0.01172", "title": "EPSS" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent EPSS score, Is related to CWE-416 (Use After Free)", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-2618547", "CSAFPID-2618548", "CSAFPID-2618549", "CSAFPID-2618550", "CSAFPID-2858634", "CSAFPID-2965651", "CSAFPID-2563067", "CSAFPID-2617521", "CSAFPID-2617522", "CSAFPID-1992579", "CSAFPID-1992585", "CSAFPID-1994226", "CSAFPID-2001071", "CSAFPID-2941214", "CSAFPID-5873934" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4271" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4271.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4271" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4271" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-4271" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4271.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-4271" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-4271" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4271" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4271.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://access.redhat.com/security/cve/CVE-2026-4271" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448044" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/496" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4271" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4271" } ], "remediations": [ { "category": "mitigation", "details": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.", "product_ids": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-2618547", "CSAFPID-2618548", "CSAFPID-2618549", "CSAFPID-2618550", "CSAFPID-2858634", "CSAFPID-2965651" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1992579", "CSAFPID-1992585", "CSAFPID-1994226", "CSAFPID-2001071", "CSAFPID-2563067", "CSAFPID-2617521", "CSAFPID-2617522", "CSAFPID-2618547", "CSAFPID-2618548", "CSAFPID-2618549", "CSAFPID-2618550", "CSAFPID-2858634", "CSAFPID-2941214", "CSAFPID-2965651", "CSAFPID-5873934" ] } ], "title": "CVE-2026-4271" } ] }