{ "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-2026-31964", "tracking": { "current_release_date": "2026-03-23T11:05:18.779389Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31964", "initial_release_date": "2026-03-18T18:38:45.550388Z", "revision_history": [ { "date": "2026-03-18T18:38:45.550388Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T18:38:47.913367Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-18T19:26:09.025646Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T19:26:11.736146Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-18T19:38:58.804526Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-03-19T00:27:41.766556Z", "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": "2026-03-19T00:27:44.174857Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-19T00:43:15.097530Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-19T00:43:27.573543Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-19T06:43:15.409676Z", "number": "10", "summary": "Description created for source." }, { "date": "2026-03-19T21:02:29.605490Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-19T21:02:32.252365Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-20T03:45:08.531199Z", "number": "13", "summary": "CVSS created.| Products connected (3).| Product Identifiers created (3)." }, { "date": "2026-03-20T03:45:11.745840Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:32:04.769664Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:32:10.932482Z", "number": "16", "summary": "NCSC Score updated." } ], "status": "interim", "version": "16" } }, "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-2026-31964", "cwe": { "id": "CWE-476", "name": "NULL Pointer Dereference" }, "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 using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. 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-2026-31964" }, { "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 using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. 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-2026-31964" }, { "category": "description", "text": "A flaw was found in HTSlib, a library for reading and writing bioinformatics file formats. When processing specially crafted CRAM (Compressed Reference-aligned Alignment Map) data, specifically records that omit sequence or quality data using the CONST, XPACK, or XRLE encodings, the library attempts to write to a NULL pointer. This NULL pointer dereference can cause the program to crash, leading to a Denial of Service (DoS).\nThis MODERATE NULL pointer dereference in HTSlib's CRAM decoder affects the CONST, XPACK, and XRLE encodings when processing records with omitted data. Exploitation requires local access and user interaction. Impact is limited to availability (crash/DoS) with no confidentiality or integrity impact. Affects htslib and python-pysam in EPEL and Fedora. Fixed in versions 1.23.1, 1.22.2, and 1.21.1.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-31964" }, { "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 using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. 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-2026-31964" }, { "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 using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. 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-2026-31964" }, { "category": "other", "text": "0.00044", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "6.9", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.6", "title": "NCSC Score" }, { "category": "other", "text": "Is related to CWE-476 (NULL Pointer Dereference)", "title": "NCSC Score top increasing factors" }, { "category": "details", "text": "Severity: 2\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-2026-31964" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31964.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31964" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31964" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-31964" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31964.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-31964" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31964" }, { "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-5w97-85gf-86rm" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/samtools/htslib/commit/e64e68da567d2309509d059ace016d5d7fc7514f" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31964" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31964" } ], "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-1396815", "CSAFPID-1396816", "CSAFPID-5844844", "CSAFPID-5844845", "CSAFPID-5844846", "CSAFPID-5859402", "CSAFPID-5859403", "CSAFPID-5859404" ] } ], "title": "CVE-2026-31964" } ] }