FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native Screenpresso decoder (libavcodec/screenpresso.c) that 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. The screenpresso_decode_frame() function fails to validate the produced byte count before calling av_image_copy_plane() to copy the complete frame dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such as userspace addresses from persistent decoding services.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104791 advisory.

    FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read     vulnerability in the native Screenpresso decoder (libavcodec/screenpresso.c) that 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. The screenpresso_decode_frame() function fails to     validate the produced byte count before calling av_image_copy_plane() to copy the complete frame     dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior     allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such     as userspace addresses from 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 Screenpresso decoder (libavcodec/screenpresso.c) that 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. The screenpresso_decode_frame() function fails to     validate the produced byte count before calling av_image_copy_plane() to copy the complete frame     dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior     allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such     as userspace addresses from persistent decoding services. (CVE-2026-70630)

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

ID	Name	Product	Family	Type	Severity
340966	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: ffmpeg (UTSA-2026-104791)	Nessus	Unity Linux Local Security Checks	Local	medium
335157	FFmpeg 3.0 < 9.0 Multiple Vulnerabilities	Nessus	Misc.	Local	medium
333320	Linux Distros Unpatched Vulnerability : CVE-2026-70630	Nessus	Misc.	Local	medium

Detections

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CVE-2026-70630

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Tenable Plugins

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