{ "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-2026-32240", "tracking": { "current_release_date": "2026-03-23T14:02:40.754152Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-32240", "initial_release_date": "2026-03-12T20:25:46.252157Z", "revision_history": [ { "date": "2026-03-12T20:25:46.252157Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)." }, { "date": "2026-03-12T20:25:52.920590Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-12T20:39:01.894298Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (5).| CWES updated (1)." }, { "date": "2026-03-12T20:39:03.677075Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-13T07:37:34.738637Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-13T12:42:38.545281Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)." }, { "date": "2026-03-13T12:42:40.067341Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-13T14:13:34.861623Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-13T16:39:11.617637Z", "number": "9", "summary": "Unknown change." }, { "date": "2026-03-14T00:27:43.436030Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Identifiers created (1).| Product Remediations created (2).| Products created (1).| References created (7).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-14T00:27:53.491821Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-18T17:26:26.781142Z", "number": "12", "summary": "CVSS created.| Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-03-18T17:26:29.042697Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:31:32.103122Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." } ], "status": "interim", "version": "14" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.4.0", "product": { "name": "vers:unknown/<1.4.0", "product_id": "CSAFPID-5810749", "product_identification_helper": { "cpe": "cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Cap'n Proto" } ], "category": "vendor", "name": "Cap'n Proto" }, { "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": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5826730" } } ], "category": "product_name", "name": "capnproto" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5814530" } } ], "category": "product_name", "name": "capnproto" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1390524" } } ], "category": "product_name", "name": "capnproto" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-32240", "cwe": { "id": "CWE-197", "name": "Numeric Truncation Error" }, "notes": [ { "category": "description", "text": "Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-32240" }, { "category": "description", "text": "Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-32240" }, { "category": "description", "text": "Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-32240" }, { "category": "description", "text": "A flaw was found in the KJ-HTTP component of Cap’n Proto when processing HTTP messages that use Transfer-Encoding: chunked. If a chunk size is parsed as a value equal to or greater than 2^64, the value may be truncated when converted to a 64-bit integer. An attacker could exploit this behavior by sending specially crafted HTTP messages containing excessively large chunk sizes. This may cause incorrect interpretation of HTTP message boundaries and could theoretically enable HTTP request or response smuggling in applications that rely on the affected HTTP implementation.\nThis issue is rated Moderate severity by Red Hat Product Security, because exploitation requires specially crafted malformed HTTP requests containing extremely large chunk size values that exceed normal protocol limits. Such requests are not generated by typical HTTP clients and may be rejected by intermediary infrastructure such as reverse proxies or load balancers before reaching the affected parser. \nAdditionally, meaningful exploitation generally depends on differences in how multiple HTTP components interpret malformed chunked encoding values. Because these conditions require non-standard inputs and specific deployment configurations, the attack complexity is considered High. The potential impact is limited to inconsistencies in HTTP request parsing that could enable limited request smuggling scenarios, without directly causing service crashes or enabling arbitrary code execution.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-32240" }, { "category": "other", "text": "0.00044", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "title": "CVSSV4" }, { "category": "other", "text": "6.3", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.5", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5810749", "CSAFPID-1390524", "CSAFPID-5814530", "CSAFPID-2858634", "CSAFPID-5826730" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32240" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-32240" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-32240" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/32xxx/CVE-2026-32240.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-32240" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-32240" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-32240" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-32240.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://capnproto.org/capnproto-c++-1.4.0.tar.gz" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://capnproto.org/capnproto-c++-win32-1.4.0.zip" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-32240" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32240" } ], "remediations": [ { "category": "mitigation", "details": "Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.", "product_ids": [ "CSAFPID-2858634", "CSAFPID-5826730" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1390524", "CSAFPID-2858634", "CSAFPID-5810749", "CSAFPID-5814530", "CSAFPID-5826730" ] } ], "title": "CVE-2026-32240" } ] }