{ "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-2026-4541", "tracking": { "current_release_date": "2026-03-23T22:27:56.202188Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4541", "initial_release_date": "2026-03-21T16:07:11.731871Z", "revision_history": [ { "date": "2026-03-21T16:07:11.731871Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-22T09:24:54.619182Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (9).| CWES updated (1)." }, { "date": "2026-03-22T09:24:57.167090Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-22T09:38:40.480735Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Products created (1).| Exploits created (1).| References created (8).| CWES updated (1)." }, { "date": "2026-03-22T09:38:44.251433Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-22T15:09:02.705530Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-23T00:44:57.352426Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Products created (2)." }, { "date": "2026-03-23T06:45:56.825926Z", "number": "8", "summary": "Description created for source." }, { "date": "2026-03-23T22:27:42.572940Z", "number": "9", "summary": "Unknown change." }, { "date": "2026-03-23T22:27:44.743699Z", "number": "10", "summary": "NCSC Score updated." } ], "status": "interim", "version": "10" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/*", "product": { "name": "vers:deb/*", "product_id": "CSAFPID-5890284" } } ], "category": "product_name", "name": "tinyssh" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/*", "product": { "name": "vers:deb/*", "product_id": "CSAFPID-5890285" } } ], "category": "product_name", "name": "tinyssh" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/20250501", "product": { "name": "vers:unknown/20250501", "product_id": "CSAFPID-5886599" } }, { "category": "product_version_range", "name": "vers:unknown/20260301", "product": { "name": "vers:unknown/20260301", "product_id": "CSAFPID-5889904" } } ], "category": "product_name", "name": "tinyssh" } ], "category": "vendor", "name": "janmojzis" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4541", "cwe": { "id": "CWE-347", "name": "Improper Verification of Cryptographic Signature" }, "notes": [ { "category": "description", "text": "A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended. If you want to get best quality of vulnerability data, you may have to visit VulDB.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4541" }, { "category": "description", "text": "A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended. If you want to get best quality of vulnerability data, you may have to visit VulDB.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4541.json" }, { "category": "description", "text": "A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended. If you want to get best quality of vulnerability data, you may have to visit VulDB.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-4541" }, { "category": "other", "text": "4e-05", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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": "1.1", "title": "CVSSV4 base score" }, { "category": "other", "text": "3.3", "title": "NCSC Score" }, { "category": "other", "text": "There is cwe data available from source Nvd, Is related to (a version of) an uncommon product, There is exploit data available from source Cveprojectv5, The value of the most recent CVSS (V3) score, Exploit code publicly available", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5886599" ], "known_not_affected": [ "CSAFPID-5889904", "CSAFPID-5890284", "CSAFPID-5890285" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4541" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4541.json" }, { "category": "external", "summary": "Source - 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-2026-4541" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/janmojzis/tinyssh/pull/102" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/janmojzis/tinyssh/releases/tag/20260301" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/janmojzis/tinyssh/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/janmojzis/tinyssh/commit/9c87269607e0d7d20174df742accc49c042cff17" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/janmojzis/tinyssh/issues/101" }, { "category": "external", "summary": "Reference - nvd", "url": "https://github.com/janmojzis/tinyssh/issues/101#issue-3983586116" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://vuldb.com/?ctiid.352358" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://vuldb.com/?id.352358" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://vuldb.com/?submit.774687" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 2.5, "baseSeverity": "LOW" }, "products": [ "CSAFPID-5886599" ] } ], "title": "CVE-2026-4541" } ] }