{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84383 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-84383 is a critical memory corruption vulnerability in strukturag libheif, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-84383 and fix it if it is affected.\n\nWhat it is: CVE-2026-84383 is a critical memory corruption vulnerability in strukturag libheif, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84383 exists.\n\nAffected product: strukturag libheif. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-84383/ (Markdown: https://insights.sbomify.com/CVE-2026-84383/index.md)","id":"CVE-2026-84383","markdown":"https://insights.sbomify.com/CVE-2026-84383/index.md","name":"CVE-2026-84383","record":{"aliases":["BELL-CVE-2026-84383","DEBIAN-CVE-2026-84383","GHSA-g89c-p67h-r497","MINI-2ghf-3gv3-g7xj"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"HEIF/AVIF image library","requires_auth":"none","summary":"A heap buffer overflow in libheif allows remote attackers to execute arbitrary code or cause denial of service via crafted HEIF/AVIF files.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-09-29","github_poc":2,"max_poc_stars":9,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-29T17:40:08Z","kind":"github_poc","ref":"https://github.com/dinosn/libheif-cve-2026-84383-lab","stars":9,"title":"Docker lab for validating CVE-2026-84383 in libheif through Discourse"},{"date":"2026-10-28T19:12:36Z","kind":"github_poc","ref":"https://github.com/sachincool/cve-2026-84383-poc","stars":0,"title":null}],"tier":"weaponised"},"has_fix":true,"headline":"libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items","id":"CVE-2026-84383","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS","id":"CVE-2026-84384"},"packages":[],"prev":{"headline":"HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)","id":"CVE-2026-84382"},"products":["libheif"],"published":"2026-09-18","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["strukturag"]},"summary":"A heap buffer overflow in libheif allows remote attackers to execute arbitrary code or cause denial of service via crafted HEIF/AVIF files.","url":"https://insights.sbomify.com/CVE-2026-84383/"}