CVE-2026-88340

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash."}], "id": "CVE-2026-88340", "lastModified": "2026-09-25T20:17:47.427", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.7, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88340", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-25T19:47:43.768045Z", "version": "2.0.3"}}]}, "published": "2026-09-22T20:17:10.250", "references": [{"source": "cve@mitre.org", "url": "https://github.com/VirusTotal/yara/issues/2239"}, {"source": "cve@mitre.org", "url": "https://github.com/VirusTotal/yara/pull/2244"}, {"source": "cve@mitre.org", "url": "https://github.com/VirusTotal/yara/pull/2244/changes/8d7bef643ee5fa2381e235bcedf80170a6b00d3b"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-763"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "yara: YARA: Memory corruption and denial of service via specially crafted rule files", "id": "2538733", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538733"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-763", "details": ["A flaw was found in YARA. This invalid pointer release vulnerability occurs during the deserialization of compiled rule files (.yrc). An attacker can exploit this by providing a specially crafted .yrc file, leading to insufficient validation of external-variable pointers. This can result in memory corruption and cause the application to crash, leading to a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, Red Hat customers should avoid processing YARA compiled rule files (`.yrc`) from untrusted or unverified sources. Ensure that YARA rules are only loaded from trusted locations and that any input files are validated before processing."}, "name": "CVE-2026-88340", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "yara", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "yara", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "yara", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88340\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88340\nhttps://github.com/VirusTotal/yara/issues/2239\nhttps://github.com/VirusTotal/yara/pull/2244\nhttps://github.com/VirusTotal/yara/pull/2244/changes/8d7bef643ee5fa2381e235bcedf80170a6b00d3b"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "4.5.8"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "yara", "vendor": "virustotal"}], "created": "2026-09-22T22:45:17.106712+00:00", "updated": "2026-09-26T05:30:04.561624+00:00", "vendors": ["virustotal", "virustotal$PRODUCT$yara"]}