CVE-2026-70630

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{"bugzilla": {"description": "ffmpeg: FFmpeg: Information disclosure via uninitialized heap memory read in Screenpresso decoder", "id": "2512259", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512259"}, "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 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.", "A flaw was found in FFmpeg. An uninitialized heap memory read vulnerability in the native Screenpresso decoder allows attackers to recover sensitive memory contents. This occurs when a crafted SPV1 packet with a valid zlib stream is supplied, causing the screenpresso_decode_frame() function to fail in validating the produced byte count. Consequently, unwritten heap memory from prior allocations or frames can be copied into decoded output, potentially exposing sensitive data."], "mitigation": {"lang": "en:us", "value": "Avoid decoding untrusted Screenpresso (SPV1) media files using FFmpeg in persistent services. If processing untrusted input is required, run FFmpeg inside an ephemeral container or restricted systemd sandbox to prevent sensitive cross-session heap data disclosure."}, "name": "CVE-2026-70630", "public_date": "2026-08-06T21:25:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-70630\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-70630\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/705890061467ad550ecc1dad5eea07f28ccfb43e\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/9a3202a98b2e095b54dd784c3e01a09a676fc3fa\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c22667d0fd7916a33fd3e79685b7246fc48f1a62\nhttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23896"], "statement": "An uninitialized heap memory disclosure flaw exists in FFmpeg's Screenpresso decoder within libavcodec/screenpresso.c. When decoding a crafted SPV1 packet containing a truncated zlib stream, screenpresso_decode_frame() fails to validate the decompressed byte length before invoking av_image_copy_plane(). Consequently, unwritten heap memory from prior allocations in ctx->inflated_buf is copied directly into rendered frame output. When FFmpeg operates in persistent or shared-process services, processing untrusted media can expose sensitive memory contents, posing a Moderate impact to confidentiality.", "threat_severity": "Moderate"}

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