FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from prior heap allocations or previous decoded frames in persistent decoding services.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104814 advisory.

    FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read     vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory     contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the     declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating     the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent     intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from     prior heap allocations or previous decoded frames in persistent decoding services.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FFmpeg installed on the remote host is 3.0 or later but prior to 9.0. It is, therefore, affected by multiple vulnerabilities:

  - An uninitialized heap memory read vulnerability in the native RSCC decoder (libavcodec/rscc.c) allows     attackers to disclose heap memory contents by supplying a crafted video file with a compressed tile that     decompresses fewer bytes than the declared tile geometry requires. (CVE-2026-70629)

  - An uninitialized heap memory read vulnerability in the native Screenpresso decoder (libavcodec/screenpresso.c)     allows attackers to recover sensitive memory contents by supplying a crafted SPV1 packet with a valid zlib     stream that decompresses fewer bytes than the full frame requires. (CVE-2026-70630)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read     vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory     contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the     declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating     the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent     intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from     prior heap allocations or previous decoded frames in persistent decoding services. (CVE-2026-70629)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
340935	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: ffmpeg (UTSA-2026-104814)	Nessus	Unity Linux Local Security Checks	Local	medium
335157	FFmpeg 3.0 < 9.0 Multiple Vulnerabilities	Nessus	Misc.	Local	medium
333302	Linux Distros Unpatched Vulnerability : CVE-2026-70629	Nessus	Misc.	Local	medium

Detections

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CVE-2026-70629

medium

Tenable Plugins

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medium

medium