CVE-2026-88341

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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": "A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate."}], "id": "CVE-2026-88341", "lastModified": "2026-09-24T21:08:22.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88341", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-23T14:59:42.656278Z", "version": "2.0.3"}}]}, "published": "2026-09-22T20:17:10.370", "references": [{"source": "cve@mitre.org", "url": "https://github.com/NOUIY/yara/commit/0cdff36723cd260243bb2b330bda555693354760"}, {"source": "cve@mitre.org", "url": "https://github.com/VirusTotal/yara/issues/2238"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/VirusTotal/yara/issues/2238"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "yara: YARA: Denial of Service via crafted compiled rule file", "id": "2538991", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538991"}, "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-617", "details": ["A flaw was found in YARA. A remote attacker could exploit this vulnerability by providing a specially crafted compiled rule file (.yrc) with an invalid arena configuration. This malicious file, when loaded, triggers an assertion failure, leading to the application's termination. This results in a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, ensure that YARA only loads compiled rule files (`.yrc`) from trusted sources. Avoid processing or loading `.yrc` files from untrusted or unverified origins. If YARA is used in an automated fashion, implement strict input validation and source verification for all rule files."}, "name": "CVE-2026-88341", "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-2026-88341\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88341\nhttps://github.com/NOUIY/yara/commit/0cdff36723cd260243bb2b330bda555693354760\nhttps://github.com/VirusTotal/yara/issues/2238"], "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": "2026-09-22T22:00:08.578320+00:00", "updated": "2026-09-23T17:30:06.831884+00:00", "vendors": ["virustotal", "virustotal$PRODUCT$yara"]}