{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-120208", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-31T11:44:49.238Z", "datePublished": "2026-10-31T17:25:55.507Z", "dateUpdated": "2026-10-31T17:25:55.507Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-31T17:25:55.507Z"}, "datePublic": "2026-09-01T00:00:00.000Z", "title": "libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder", "descriptions": [{"lang": "en", "value": "libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Heap-based Buffer Overflow", "cweId": "CWE-122", "type": "CWE"}]}], "affected": [{"vendor": "strukturag", "product": "libheif", "defaultStatus": "unaffected", "versions": [{"version": "1.18.0", "lessThan": "1.23.3", "status": "affected", "versionType": "semver"}], "repo": "https://github.com/strukturag/libheif"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.7, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/strukturag/libheif/security/advisories/GHSA-x8r2-mggj-j6wr", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-x8r2-mggj-j6wr)"}, {"url": "https://github.com/strukturag/libheif/commit/9d3cd91d7b1c8c68deef6d06057ab956bcb0dfb9", "tags": ["patch"]}, {"url": "https://github.com/strukturag/libheif/releases/tag/v1.23.3", "tags": ["release-notes"], "name": "libheif v1.23.3 Release Notes"}, {"url": "https://github.com/strukturag/libheif/blob/v1.23.2/libheif/codecs/uncompressed/unc_decoder_mixed_interleave.cc#L95", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/libheif-1.18.0-before-1.23.3-heap-buffer-overflow-via-unci-mixed-interleave-decoder"}], "credits": [{"lang": "en", "value": "Alex Thomas (Wordfence)", "type": "finder"}, {"lang": "en", "value": "poppo25", "type": "finder"}, {"lang": "en", "value": "Wordfence Argus", "type": "tool"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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