CVE-2026-70631

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{"bugzilla": {"description": "FFmpeg: FFmpeg: Information disclosure via uninitialized heap memory read in TIFF decoder", "id": "2512210", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512210"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-824", "details": ["FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply a valid Deflate-compressed strip that terminates successfully after producing fewer bytes than the declared strip requires. The tiff_unpack_zlib() function allocates a heap buffer sized for the full declared strip but copies all declared rows via memcpy() regardless of how many bytes zlib actually decompressed, causing unwritten bytes that can contain stale data from prior heap allocations to be incorporated into decoded image output and potentially exposing sensitive data in persistent services.", "A flaw was found in FFmpeg. An attacker can exploit an uninitialized heap memory disclosure vulnerability in the native TIFF decoder by providing a specially crafted TIFF file. This crafted file can cause the `tiff_unpack_zlib()` function to include stale data from previous memory allocations in the decoded image output. This could potentially expose sensitive information in persistent services."], "mitigation": {"lang": "en:us", "value": "Avoid processing untrusted TIFF files using FFmpeg in persistent or shared-process services. If processing untrusted media is required, isolate FFmpeg execution within an ephemeral container or tightly restricted systemd/SELinux sandbox to prevent cross-session memory disclosure."}, "name": "CVE-2026-70631", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "ffmpeg", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/bootc-aws-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/bootc-azure-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/bootc-azure-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "rhelai3/bootc-gcp-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/bootc-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-vllm-gaudi-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-08-06T21:25:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-70631\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-70631\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2f234ea34c81288e3840fca632dd16481d8de39f\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/3c287af3affe1286350faa69c02bcc5d49de18bb\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/a991b1fecbd8c9e6f4fc31c191bd12e4be27dbf7\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23899"], "statement": "An uninitialized heap memory disclosure flaw exists in FFmpeg's native TIFF decoder within libavcodec/tiff.c. When decoding a crafted TIFF file containing an undersized Deflate-compressed strip, tiff_unpack_zlib() fails to verify actual decompressed output length before executing frame-buffer memcpy() operations. This incorporates uninitialized stale heap memory from prior allocations into the rendered image stream. When FFmpeg runs as a persistent service, remote or local users supplying malformed inputs can leak sensitive memory contents, posing a Moderate impact to confidentiality.", "threat_severity": "Moderate"}

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