{"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"}}}}