{ "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-2026-31970", "tracking": { "current_release_date": "2026-03-23T01:38:14.826880Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31970", "initial_release_date": "2026-03-18T20:26:26.377197Z", "revision_history": [ { "date": "2026-03-18T20:26:26.377197Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T20:26:28.277228Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-18T20:38:55.550350Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (2).| CWES updated (1).| Unknown change." }, { "date": "2026-03-18T20:38:58.373138Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-18T23:38:48.359718Z", "number": "5", "summary": "References created (1)." }, { "date": "2026-03-19T00:24:59.607033Z", "number": "6", "summary": "References created (1)." }, { "date": "2026-03-19T00:43:21.933974Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-19T00:43:27.573543Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-19T06:43:10.553859Z", "number": "9", "summary": "Description created for source." }, { "date": "2026-03-19T21:05:24.193731Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (3).| Products connected (2).| References created (3).| CWES updated (1)." }, { "date": "2026-03-19T21:05:26.703782Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:32:01.910208Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." } ], "status": "interim", "version": "12" } }, "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", "product": { "name": "vers:unknown/<1.21", "product_id": "CSAFPID-5859405", "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-2026-31970", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. GZI files are used to index block-compressed GZIP [BGZF] files. In the GZI loading function, `bgzf_index_load_hfile()`, it was possible to trigger an integer overflow, leading to an under- or zero-sized buffer being allocated to store the index. Sixteen zero bytes would then be written to this buffer, and, depending on the result of the overflow the rest of the file may also be loaded into the buffer as well. If the function did attempt to load the data, it would eventually fail due to not reading the expected number of records, and then try to free the overflowed 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. The easiest work-around is to discard any `.gzi` index files from untrusted sources, and use the `bgzip -r` option to recreate them.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31970" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. GZI files are used to index block-compressed GZIP [BGZF] files. In the GZI loading function, `bgzf_index_load_hfile()`, it was possible to trigger an integer overflow, leading to an under- or zero-sized buffer being allocated to store the index. Sixteen zero bytes would then be written to this buffer, and, depending on the result of the overflow the rest of the file may also be loaded into the buffer as well. If the function did attempt to load the data, it would eventually fail due to not reading the expected number of records, and then try to free the overflowed 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. The easiest work-around is to discard any `.gzi` index files from untrusted sources, and use the `bgzip -r` option to recreate them.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31970" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. GZI files are used to index block-compressed GZIP [BGZF] files. In the GZI loading function, `bgzf_index_load_hfile()`, it was possible to trigger an integer overflow, leading to an under- or zero-sized buffer being allocated to store the index. Sixteen zero bytes would then be written to this buffer, and, depending on the result of the overflow the rest of the file may also be loaded into the buffer as well. If the function did attempt to load the data, it would eventually fail due to not reading the expected number of records, and then try to free the overflowed 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. The easiest work-around is to discard any `.gzi` index files from untrusted sources, and use the `bgzip -r` option to recreate them.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-31970" }, { "category": "description", "text": "HTSlib is a library for reading and writing bioinformatics file formats. GZI files are used to index block-compressed GZIP [BGZF] files. In the GZI loading function, `bgzf_index_load_hfile()`, it was possible to trigger an integer overflow, leading to an under- or zero-sized buffer being allocated to store the index. Sixteen zero bytes would then be written to this buffer, and, depending on the result of the overflow the rest of the file may also be loaded into the buffer as well. If the function did attempt to load the data, it would eventually fail due to not reading the expected number of records, and then try to free the overflowed 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. The easiest work-around is to discard any `.gzi` index files from untrusted sources, and use the `bgzip -r` option to recreate them.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31970" }, { "category": "other", "text": "0.00043", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/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": "7.1", "title": "CVSSV4 base score" }, { "category": "other", "text": "3.8", "title": "NCSC Score" }, { "category": "other", "text": "Is related to CWE-1284 (Improper Validation of Specified Quantity in Input), There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5844844", "CSAFPID-5844845", "CSAFPID-5844846", "CSAFPID-1396815", "CSAFPID-1396816", "CSAFPID-5859403", "CSAFPID-5859404", "CSAFPID-5859405" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31970" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31970" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31970" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31970.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-31970" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31970" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/samtools/htslib/commit/6dd0d7d0e9e7e2e173a28969e624db8bc8bb5828" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/samtools/htslib/security/advisories/GHSA-p345-84hx-fq6q" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "http://www.openwall.com/lists/oss-security/2026/03/18/9" } ], "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-5859403", "CSAFPID-5859404", "CSAFPID-5859405" ] } ], "title": "CVE-2026-31970" } ] }