CVE-2026-31967

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CRAM is a compressed format which stores DNA sequence alignment data. In the `cram_decode_slice()` function called while reading CRAM records, the value of the mate reference id field was not validated. Later use of this value, for example when converting the data to SAM format, could result in the out of bounds array reads when looking up the corresponding reference name. If the array value obtained also happened to be a valid pointer, it would be interpreted as a string and an attempt would be made to write the data as part of the SAM record. This bug may allow information about program state to be leaked. It may also cause a program crash through an attempt to access invalid memory. 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": "HTSlib es una biblioteca para leer y escribir formatos de archivo bioinform\u00e1ticos. CRAM es un formato comprimido que almacena datos de alineaci\u00f3n de secuencias de ADN. En la funci\u00f3n 'cram_decode_slice()' llamada al leer registros CRAM, el valor del campo 'mate reference id' no fue validado. El uso posterior de este valor, por ejemplo al convertir los datos a formato SAM, podr\u00eda resultar en lecturas de array fuera de l\u00edmites al buscar el nombre de referencia correspondiente. Si el valor del array obtenido tambi\u00e9n resultara ser un puntero v\u00e1lido, ser\u00eda interpretado como una cadena y se intentar\u00eda escribir los datos como parte del registro SAM. Este error podr\u00eda permitir que se filtre informaci\u00f3n sobre el estado del programa. Tambi\u00e9n podr\u00eda causar un fallo del programa a trav\u00e9s de un intento de acceder a memoria inv\u00e1lida. Las versiones 1.23.1, 1.22.2 y 1.21.1 incluyen correcciones para este problema. No hay soluci\u00f3n alternativa para este problema."}], "id": "CVE-2026-31967", "lastModified": "2026-06-17T10:34:51.527", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31967", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-18T19:58:48.919498Z", "version": "2.0.3"}}]}, "published": "2026-03-18T20:16:21.280", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/samtools/htslib/commit/9cefb46453ad471e933b8212d4f45920524d3357"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/samtools/htslib/security/advisories/GHSA-33x5-c6vj-8f2w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-129"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.21.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.22,1.22.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.23"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "product": "htslib", "vendor": "samtools"}], "analysis": {"en": {"generated_at": "2026-03-19T15:29:55.090568+00:00", "value": {"mitigation_remediation": ["Upgrade HTSlib to version 1.23.1 or later; the latest release contains the patch."], "summary": {"action": "Apply Patch", "impact": "Information Disclosure / Crash"}, "threat_synthesis": {"affected_systems": "Affected products are HTSlib used within the samtools:htslib ecosystem. The vulnerability is present in releases 1.21.1, 1.22.2, and 1.23.0. Fixes are included in version 1.23.1 and later releases. No other vendors or products are listed in the known CNA data.", "description_and_impact": "HTSlib contains an out\u2011of\u2011bounds read in the cram_decode_slice() function due to lack of validation of the mate reference id field. This flaw allows an attacker who supplies a malicious CRAM file to cause the library to read beyond intended array bounds and potentially expose internal program state or crash the process. The weakness matches the Common Weakness Enumerations CWE-125 and CWE-129, indicating an out\u2011of\u2011bounds read and signed/unsigned mismatch. The impact is limited to information disclosure and denial of service within the context of the application using the library; it does not provide remote code execution or privilege escalation on its own.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a medium severity vulnerability. The EPSS score is below 1%, suggesting that the likelihood of active exploitation is low, and the issue is not currently listed in the CISA KEV catalog. Exploitation would require an attacker to supply a crafted CRAM file to a vulnerable application; no remote network attack vector is specified in the input. Thus, the overall risk is moderate but depends on whether the affected HTSlib version is used in publicly accessible pipelines."}}}}, "created": "2026-03-19T08:55:41.051652+00:00", "updated": "2026-03-25T11:52:23.610243+00:00", "vendors": ["samtools", "samtools$PRODUCT$htslib"]}