Use of Uninitialized Resource Affecting ffmpeg package, versions [4.2.1,9.0.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-CONAN-FFMPEG-18599383
- published9 Aug 2026
- disclosed7 Aug 2026
- creditAdrian Junge
Introduced: 7 Aug 2026
NewCVE-2026-70630 (opens in a new tab)How to fix?
Upgrade ffmpeg to version 9.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Use of Uninitialized Resource via the screenpresso_decode_frame() function in libavcodec/screenpresso.c. An attacker can recover sensitive heap contents by supplying a crafted SPV1 packet whose zlib payload decompresses to fewer bytes than a full frame. The decoder copies a full frame from the persistent ctx->inflated_buf buffer even when the decompressed output is too short, so unwritten heap bytes from prior allocations or prior frames are included in the decoded image. In persistent decoding services, this exposes memory contents such as userspace addresses to the attacker.