{ "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-2026-31963", "tracking": { "current_release_date": "2026-03-23T11:05:23.141658Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31963", "initial_release_date": "2026-03-18T18:38:45.040569Z", "revision_history": [ { "date": "2026-03-18T18:38:45.040569Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (3).| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T18:38:46.871553Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-18T19:26:08.385665Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T19:26:10.461763Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-18T19:38:58.357216Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-03-19T00:28:47.640885Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-19T00:28:50.344664Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-19T00:43:13.841636Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-19T06:43:16.325639Z", "number": "9", "summary": "Description created for source." }, { "date": "2026-03-19T21:02:15.470770Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-19T21:02:26.575953Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-20T03:44:59.450493Z", "number": "12", "summary": "CVSS created.| Products connected (3).| Product Identifiers created (3)." }, { "date": "2026-03-20T03:45:07.179887Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:32:05.197661Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:32:10.932482Z", "number": "15", "summary": "NCSC Score updated." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.23", "product": { "name": "vers:unknown/1.23", "product_id": "CSAFPID-5859404", "product_identification_helper": { "cpe": "cpe:2.3:a:htslib:htslib:1.23:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<1.21.1", "product": { "name": "vers:unknown/<1.21.1", "product_id": "CSAFPID-5859402", "product_identification_helper": { "cpe": "cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=1.22|<1.22.2", "product": { "name": "vers:unknown/>=1.22|<1.22.2", "product_id": "CSAFPID-5859403", "product_identification_helper": { "cpe": "cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "HTSlib" } ], "category": "vendor", "name": "HTSlib" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1396815" } } ], "category": "product_name", "name": "htslib" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1396816" } } ], "category": "product_name", "name": "htslib" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.23", "product": { "name": "vers:unknown/1.23", "product_id": "CSAFPID-5844846" } }, { "category": "product_version_range", "name": "vers:unknown/<1.21.1", "product": { "name": "vers:unknown/<1.21.1", "product_id": "CSAFPID-5844844" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.22|<1.22.2", "product": { "name": "vers:unknown/>=1.22|<1.22.2", "product_id": "CSAFPID-5844845" } } ], "category": "product_name", "name": "htslib" } ], "category": "vendor", "name": "samtools" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-31963", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of \"features\". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31963" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of \"features\". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31963" }, { "category": "description", "text": "A flaw was found in HTSlib, a library for reading and writing bioinformatics file formats. When processing CRAM (Compressed Reference-oriented Alignment Map) files, an out-by-one error in feature decoding can cause a heap buffer overflow. This vulnerability allows an attacker to craft a malicious CRAM file which, when opened by a user, could lead to a program crash, data corruption, or potentially arbitrary code execution.\nThis is an IMPORTANT flaw due to a heap buffer overflow in the HTSlib CRAM reader when processing specially crafted CRAM files. This flaw requires user interaction, as it is triggered when an application linked against HTSlib opens a malicious CRAM file, potentially leading to arbitrary code execution or data corruption.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-31963" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of \"features\". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-31963" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of \"features\". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31963" }, { "category": "other", "text": "0.00076", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "8.8", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Cveprojectv5", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "The value of the most recent EPSS score, There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5844844", "CSAFPID-5844845", "CSAFPID-5844846", "CSAFPID-1396815", "CSAFPID-1396816", "CSAFPID-5859402", "CSAFPID-5859403", "CSAFPID-5859404" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31963" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31963.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31963" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31963" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-31963" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31963.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-31963" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31963" }, { "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://github.com/samtools/htslib/security/advisories/GHSA-qgqh-h2q9-7w3c" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/samtools/htslib/commit/8bcc9907be0f945ddc31796d64f078fa05456acd" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31963" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31963" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1396815", "CSAFPID-1396816", "CSAFPID-5844844", "CSAFPID-5844845", "CSAFPID-5844846", "CSAFPID-5859402", "CSAFPID-5859403", "CSAFPID-5859404" ] } ], "title": "CVE-2026-31963" } ] }