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{"acknowledgement": "Red Hat would like to thank Harsh Jaiswal for reporting this issue.", "bugzilla": {"description": "libheif: libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items", "id": "2538121", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538121"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["libheif is a HEIF and AVIF file format decoder and encoder. From 1.22.0 until 1.23.2, a crafted HEIF, HEIC, or AVIF item graph using nested iden and auxl references can make HeifPixelImage::transfer_channel_from_image_as() append duplicate Alpha planes with different bit depths to m_storage. HeifPixelImage::scale_nearest_neighbor() in libheif/image/pixelimage.cc allocates the destination Alpha plane using the first plane's 8-bit depth, then iterates a later 10-bit or 12-bit Alpha component and writes uint16_t samples into the same 8-bit allocation. The output geometry controls the overflow extent and the encoded sample values control the data written, allowing a remote file processed by heif_decode_image() to cause a heap out-of-bounds write. This issue is fixed in version 1.23.2.", "A critical heap buffer overflow vulnerability exists in libheif versions 1.22.0 through 1.23.1. When decoding a maliciously crafted HEIF, HEIC, or AVIF file using nested iden and auxl references, HeifPixelImage::transfer_channel_from_image_as() can inappropriately append duplicate Alpha planes with differing bit depths. Consequently, scale_nearest_neighbor() in libheif/image/pixelimage.cc allocates an 8-bit destination Alpha plane but writes 10-bit or 12-bit uint16_t samples into it. This allows an unauthenticated remote attacker to trigger an out-of-bounds heap write via heif_decode_image(), which can be leveraged for arbitrary code execution. The issue is resolved in version 1.23.2."], "name": "CVE-2026-84383", "package_state": [{"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Not affected", "package_name": "rh-podman-desktop", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Not affected", "package_name": "rh-podman-desktop.git", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "glycin-loaders", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-gaudi-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-feature-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Not affected", "package_name": "rhtas/rekor-search-ui-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-09-18T15:55:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-84383\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-84383\nhttps://github.com/strukturag/libheif/commit/f4fb8bde4704ebb46e46ff9fb94407c9774153b2\nhttps://github.com/strukturag/libheif/releases/tag/v1.23.2\nhttps://github.com/strukturag/libheif/security/advisories/GHSA-g89c-p67h-r497"], "statement": "This vulnerability is rated as Critical because an attacker can achieve out-of-bounds heap memory writes and potential remote code execution simply by convincing an application to parse a specially crafted media file. Exploitation does not require elevated access and carries a severe blast radius depending on the privileges of the consuming process. Across Red Hat environments, core platforms either do not bundle the vulnerable routines or remain unaffected, confining risk primarily to client-side applications that ingest untrusted graphic files.", "threat_severity": "Critical"}