{ "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-2026-3945", "tracking": { "current_release_date": "2026-04-01T11:36:24.368678Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-3945", "initial_release_date": "2026-03-01T21:29:58.107845Z", "revision_history": [ { "date": "2026-03-01T21:29:58.107845Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-30T08:25:33.322619Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)." }, { "date": "2026-03-30T08:25:35.879771Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-30T11:35:03.293202Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-30T12:07:00.999388Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Products created (1).| References created (4)." }, { "date": "2026-03-30T12:07:07.609971Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-30T14:14:26.974801Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-30T14:14:38.657263Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-30T15:39:40.866491Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (5).| CWES updated (1).| Unknown change." }, { "date": "2026-03-30T15:39:42.651053Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-31T00:44:14.463828Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-31T00:44:21.369383Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-31T06:45:06.378626Z", "number": "13", "summary": "Description created for source." }, { "date": "2026-04-01T11:36:22.641187Z", "number": "14", "summary": "Products connected (1).| Product Identifiers created (1).| References created (1)." } ], "status": "interim", "version": "14" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317176", "product_identification_helper": { "cpe": "cpe:/o:suse:opensuse:-" } } } ], "category": "product_name", "name": "SUSE openSUSE" } ], "category": "vendor", "name": "SUSE" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=1.11.3", "product": { "name": "vers:unknown/<=1.11.3", "product_id": "CSAFPID-5963519" } } ], "category": "product_name", "name": "Tinyproxy" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5209771" } } ], "category": "product_name", "name": "tinyproxy" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5209772" } } ], "category": "product_name", "name": "tinyproxy" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=1.11.3", "product": { "name": "vers:unknown/<=1.11.3", "product_id": "CSAFPID-5965391" } } ], "category": "product_name", "name": "tinyproxy" } ], "category": "vendor", "name": "tinyproxy" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-3945", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol() without properly validating overflow conditions (e.g., errno == ERANGE). A crafted chunk size such as 0x7fffffffffffffff (LONG_MAX) bypasses the existing validation check (chunklen < 0), leading to a signed integer overflow during arithmetic operations (chunklen + 2). This results in incorrect size calculations, causing the proxy to attempt reading an extremely large amount of request-body data and holding worker connections open indefinitely. An attacker can exploit this behavior to exhaust all available worker slots, preventing new connections from being accepted and causing complete service unavailability. Upstream addressed this issue in commit bb7edc4; however, the latest stable release (1.11.3) remains affected at the time of publication.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3945" }, { "category": "description", "text": "An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol() without properly validating overflow conditions (e.g., errno == ERANGE). A crafted chunk size such as 0x7fffffffffffffff (LONG_MAX) bypasses the existing validation check (chunklen < 0), leading to a signed integer overflow during arithmetic operations (chunklen + 2). This results in incorrect size calculations, causing the proxy to attempt reading an extremely large amount of request-body data and holding worker connections open indefinitely. An attacker can exploit this behavior to exhaust all available worker slots, preventing new connections from being accepted and causing complete service unavailability. Upstream addressed this issue in commit bb7edc4; however, the latest stable release (1.11.3) remains affected at the time of publication.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3945.json" }, { "category": "description", "text": "An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol() without properly validating overflow conditions (e.g., errno == ERANGE). A crafted chunk size such as 0x7fffffffffffffff (LONG_MAX) bypasses the existing validation check (chunklen < 0), leading to a signed integer overflow during arithmetic operations (chunklen + 2). This results in incorrect size calculations, causing the proxy to attempt reading an extremely large amount of request-body data and holding worker connections open indefinitely. An attacker can exploit this behavior to exhaust all available worker slots, preventing new connections from being accepted and causing complete service unavailability. Upstream addressed this issue in commit bb7edc4; however, the latest stable release (1.11.3) remains affected at the time of publication.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-3945" }, { "category": "other", "text": "0.00048", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": "8.7", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.7", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5965391", "CSAFPID-5209771", "CSAFPID-5209772", "CSAFPID-1317176" ], "last_affected": [ "CSAFPID-5963519" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3945" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0909.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3945.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-3945" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/tinyproxy/tinyproxy/commit/969852c" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/tinyproxy/tinyproxy/commit/bb7edc4" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/tinyproxy/tinyproxy/issues/602" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/tinyproxy/tinyproxy/pull/603" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/tinyproxy/tinyproxy/releases" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0909.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0909" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/advisories/GHSA-6vhj-8f7g-v7f7" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452951" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/AHB4AO7PIO54N4BWVASCZZDM24D5B3EG/" } ], "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:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1317176", "CSAFPID-5209771", "CSAFPID-5209772", "CSAFPID-5963519", "CSAFPID-5965391" ] } ], "title": "CVE-2026-3945" } ] }