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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap."}], "id": "CVE-2026-5673", "lastModified": "2026-04-06T10:16:03.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 4.2, "source": "secalert@redhat.com", "type": "Primary"}]}, "published": "2026-04-06T10:16:03.400", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-5673"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455340"}, {"source": "secalert@redhat.com", "url": "https://github.com/xiph/theora/issues/24"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "secalert@redhat.com", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank ChenZhengzhe (HangZhouDianZi University) for reporting this issue.", "bugzilla": {"description": "libtheora: libtheora: Denial of Service or Information Disclosure via malformed AVI file processing", "id": "2455340", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455340"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should avoid opening untrusted AVI files. Exercise caution when handling AVI files from unknown or suspicious sources."}, "name": "CVE-2026-5673", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "libtheora", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "libtheora", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "libtheora", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libtheora", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libtheora", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-06T09:16:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5673\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5673\nhttps://github.com/xiph/theora/issues/24"], "statement": "Moderate: A heap-based out-of-bounds read flaw in libtheora's AVI parser can lead to a denial-of-service or information leak. Exploitation requires a local attacker to trick a user into opening a specially crafted AVI file.", "threat_severity": "Moderate"}

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